Mathematics
Application of Derivatives
Previous Years Questions

## MCQ (More than One Correct Answer)

Let $$\alpha=\sum\limits_{k = 1}^\infty {{{\sin }^{2k}}\left( {{\pi \over 6}} \right)}$$ Let $g:[0,1] \rightarrow \mathbb{R}$ be the function d...
Let f : R $$\to$$ R be given by$$f(x) = (x - 1)(x - 2)(x - 5)$$. Define$$F(x) = \int\limits_0^x {f(t)dt}$$, x > 0Then which of the following opt...
Let, $$f(x) = {{\sin \pi x} \over {{x^2}}}$$, x > 0Let x1 < x2 < x3 < ... < xn < ... be all the points of local maximum of f and y1 ...
f : R $$\to$$ R is a differentiable function such that f'(x) > 2f(x) for all x$$\in$$R, and f(0) = 1 then
If $$f(x) = \left| {\matrix{ {\cos 2x} & {\cos 2x} & {\sin 2x} \cr { - \cos x} & {\cos x} & { - \sin x} \cr {\sin x} &... Let f: R$$ \to \left( {0,\infty } \right)$$and g : R$$ \to $$R be twice differentiable functions such that f'' and g'' are continuous functions on... Let$$f, g :\left[ { - 1,2} \right] \to R$$be continuous functions which are twice differentiable on the interval$$(-1, 2)$$. Let the values of... The function$$f(x) = 2\left| x \right| + \left| {x + 2} \right| - \left| {\left| {x + 2} \right| - 2\left| x \right|} \right|$$has a local minimum o... A rectangular sheet of fixed perimeter with sides having their lengths in the ratio$$8:15$$is converted into an open rectangular box by folding afte... If$$f\left( x \right) = \int_0^x {{e^{{t^2}}}} \left( {t - 2} \right)\left( {t - 3} \right)dt$$for all$$x \in \left( {0,\infty } \right),$$then For the function$$$f\left( x \right) = x\cos \,{1 \over x},x \ge 1,f(x)$$is cubic polynomial with$$f(2)=18$$and$$f(1)=-1$$. Also$$f(x)$$has local maxima at$$x=-1$$and$$f'(x)$$has local minima at$$x=0$$, t... Let$$f\left( x \right) = \left\{ {\matrix{ {{e^x},} & {0 \le x \le 1} \cr {2 - {e^{x - 1}},} & {1 < x \le 2} \cr {x - e,} &am... The function $$f\left( x \right) = \int\limits_{ - 1}^x {t\left( {{e^t} - 1} \right)\left( {t - 1} \right){{\left( {t - 2} \right)}^3}\,\,\,{{\left( {... Let$$h\left( x \right) = f\left( x \right) - {\left( {f\left( x \right)} \right)^2} + {\left( {f\left( x \right)} \right)^3}$$for every real number ... If$$f\left( x \right) = \left\{ {\matrix{ {3{x^2} + 12x - 1,} & { - 1 \le x \le 2} \cr {37 - x} & {2 < x \le 3} \cr } } \right... If the line $$ax+by+c=0$$ is a normal to the curve $$xy=1$$, then ## MCQ (Single Correct Answer) Consider the rectangles lying the region $$\left\{ {(x,y) \in R \times R:0\, \le \,x\, \le \,{\pi \over 2}} \right.$$ and $$\left. {0\, \le \,y\, \le... Which of the following options is the only INCORRECT combination? Which of the following options is the only CORRECT combination? Which of the following options is the only CORRECT combination? The least value of a$$ \in R$$for which$$4a{x^2} + {1 \over x} \ge 1,$$, for all$$x>0$$. is Let$$f:\left[ {0,1} \right] \to R$$(the set of all real numbers) be a function. Suppose the function$$f$$is twice differentiable,$$f(0) = f(1)=0$...
Let $$f:\left[ {0,1} \right] \to R$$ (the set of all real numbers) be a function. Suppose the function $$f$$ is twice differentiable, $$f(0) = f(1)=0... Let$$f\left( x \right) = {\left( {1 - x} \right)^2}\,\,{\sin ^2}\,\,x + {x^2}$$for all$$x \in IR$$and let$$g\left( x \right) = \int\limits_1^x {...
Let $$f\left( x \right) = {\left( {1 - x} \right)^2}\,\,{\sin ^2}\,\,x + {x^2}$$ for all $$x \in IR$$ and let $$g\left( x \right) = \int\limits_1^x {... Consider the two curves$${C_1}:{y^2} = 4x,\,{C_2}:{x^2} + {y^2} - 6x + 1 = 0$$. Then, The total number of local maxima and local minimum of the function$$f\left( x \right) = \left\{ {\matrix{ {{{\left( {2 + x} \right)}^3},} & {...
Let the function $$g:\left( { - \infty ,\infty } \right) \to \left( { - {\pi \over 2},{\pi \over 2}} \right)$$ be given by $$g\left( u \right) = 2{... The tangent to the curve$$y = {e^x}$$drawn at the point$$\left( {c,{e^c}} \right)$$intersects the line joining the points$$\left( {c - 1,{e^{c -...
If a continuous function $$f$$ defined on the real line $$R$$, assumes positive and negative values in $$R$$ then the equation $$f(x)=0$$ has a root i...
If a continuous function $$f$$ defined on the real line $$R$$, assumes positive and negative values in $$R$$ then the equation $$f(x)=0$$ has a root i...
If a continuous function $$f$$ defined on the real line $$R$$, assumes positive and negative values in $$R$$ then the equation $$f(x)=0$$ has a root i...
If $$P(x)$$ is a polynomial of degree less than or equal to $$2$$ and $$S$$ is the set of all such polynomials so that $$P(0)=0$$, $$P(1)=1$$ and $$P... If$$f\left( x \right) = {x^3} + b{x^2} + cx + d$$and$$0 < {b^2} < c,$$then in$$\left( { - \infty ,\infty } \right)$$If$$f\left( x \right) = {x^a}\log x$$and$$f\left( 0 \right) = 0,$$then the value of$$\alpha $$for which Rolle's theorem can be applied in$$\lef...
In $$\left[ {0,1} \right]$$ Languages Mean Value theorem is NOT applicable to
Tangent is drawn to ellipse $${{{x^2}} \over {27}} + {y^2} = 1\,\,\,at\,\left( {3\sqrt 3 \cos \theta ,\sin \theta } \right)\left( {where\,\,\theta \... The length of a longest interval in which the function$$3\,\sin x - 4{\sin ^3}x$$is increasing, is The point(s) in the curve$${y^3} + 3{x^2} = 12y$$where the tangent is vertical, is (are) If$$f\left( x \right) = x{e^{x\left( {1 - x} \right)}},$$then$$f(x)$$is The triangle formed by the tangent to the curve$$f\left( x \right) = {x^2} + bx - b$$at the point$$(1, 1)$$and the coordinate axex, lies in the fi... Let$$f\left( x \right) = \left( {1 + {b^2}} \right){x^2} + 2bx + 1$$and let$$m(b)$$be the minimum value of$$f(x)$$. As$$b$$varies, the range o... Consider the following statements in$$S$$and$$RS:\,\,\,$$Both$$\sin \,\,x$$and$$\cos \,\,x$$are decreasing functions in the interv... If the normal to the curve$$y = f\left( x \right)$$and the point$$(3, 4)$$makes an angle$${{{3\pi } \over 4}}$$with the positive$$x$$-axis, the... Let$$f\left( x \right) = \int {{e^x}\left( {x - 1} \right)\left( {x - 2} \right)dx.} $$Then$$f$$decreases in the interval Let$$f\left( x \right) = \left\{ {\matrix{ {\left| x \right|,} & {for} & {0 < \left| x \right| \le 2} \cr {1,} & {for} & {...
For all $$x \in \left( {0,1} \right)$$
The function $$f(x)=$$ $${\sin ^4}x + {\cos ^4}x$$ increases if
The number of values of $$x$$ where the function $$f\left( x \right) = \cos x + \cos \left( {\sqrt 2 x} \right)$$ attains its maximum is
If $$f\left( x \right) = {{{x^2} - 1} \over {{x^2} + 1}},$$ for every real number $$x$$, then the minimum value of $$f$$
If $$f\left( x \right) = {x \over {\sin x}}$$ and $$g\left( x \right) = {x \over {\tan x}}$$, where $$0 < x \le 1$$, then in this interval
The function $$f\left( x \right) = {{in\,\left( {\pi + x} \right)} \over {in\,\left( {e + x} \right)}}$$ is
On the interval $$\left[ {0,1} \right]$$ the function $${x^{25}}{\left( {1 - x} \right)^{75}}$$ takes its maximum value at the point
The slope of the tangent to a curve $$y = f\left( x \right)$$ at $$\left[ {x,\,f\left( x \right)} \right]$$ is $$2x+1$$. If the curve passes through t...
The function defined by $$f\left( x \right) = \left( {x + 2} \right){e^{ - x}}$$
Which one of the following curves cut the parabola $${y^2} = 4ax$$ at right angles?
The smallest positive root of the equation, $$\tan x - x = 0$$ lies in
Let $$f$$ and $$g$$ be increasing and decreasing functions, respectively from $$\left[ {0,\infty } \right)$$ to $$\left[ {0,\infty } \right)$$. Let $$... Let$$P\left( x \right) = {a_0} + {a_1}{x^2} + {a_2}{x^4} + ...... + {a_n}{x^{2n}}$$be a polynomial in a real variable$$x$$with$$0 < {a_0} &l...
If $$a+b+c=0$$, then the quadratic equation $$3a{x^2} + 2bx + c = 0$$ has
$$AB$$ is a diameter of a circle and $$C$$ is any point on the circumference of the circle. Then
The normal to the curve $$\,x = a\left( {\cos \theta + \theta \sin \theta } \right)$$, $$y = a\left( {\sin \theta - \theta \cos \theta } \right)$$ a...
If $$y = a\,\,In\,x + b{x^2} + x$$ has its extreamum values at $$x=-1$$ and $$x=2$$, then

## Numerical

For each positive integer n, let $${y_n} = {1 \over n}(n + 1)(n + 2)...{(n + n)^{{1 \over n}}}$$. For x$$\in$$R, let [x] be the greatest integer les...
A cylindrical container is to be made from certain solid material with the following constraints: It has a fixed inner volume of $$V$$ $$m{m^3}$$, has...
The slope of the tangent to the curve $${\left( {y - {x^5}} \right)^2} = x{\left( {1 + {x^2}} \right)^2}$$ at the point $$(1, 3)$$ is
Let $$f:IR \to IR$$ be defined as $$f\left( x \right) = \left| x \right| + \left| {{x^2} - 1} \right|.$$ The total number of points at which $$f$$ att...
Let $$p(x)$$ be a real polynomial of least degree which has a local maximum at $$x=1$$ and a local minimum at $$x=3$$. If $$p(1)=6$$ and $$p(3)=2$$, t...
Let $$f$$ be a real-valued differentiable function on $$R$$ (the set of all real numbers) such that $$f(1)=1$$. If the $$y$$-intercept of the tangent ...
Let $$f$$ be a function defined on $$R$$ (the set of all real numbers) such that $$f'\left( x \right) = 2010\left( {x - 2009} \right){\left( {x - 201... Let$$p(x)$$be a polynomial of degree$$4$$having extremum at$$x = 1,2$$and$$\mathop {\lim }\limits_{x \to 0} \left( {1 + {{p\left( x \right)} \...
The maximum value of the function $$f\left( x \right) = 2{x^3} - 15{x^2} + 36x - 48$$ on the set $${\rm A} = \left\{ {x|{x^2} + 20 \le 9x} \right\}$$...
The maximum value of the function $$f\left( x \right) = 2{x^3} - 15{x^2} + 36x - 48$$ on the set $${\rm A} = \left\{ {x|{x^2} + 20 \le 9x} \right\}$$...

## Subjective

For a twice differentiable function $$f(x),g(x)$$ is defined as $$4\sqrt {65} g\left( x \right) = \left( {f'{{\left( x \right)}^2} + f''\left( x \righ... If$$\left| {f\left( {{x_1}} \right) - f\left( {{x_2}} \right)} \right| < {\left( {{x_1} - {x_2}} \right)^2},$$for all$${x_1},{x_2} \in R$$. Fin... If$$p(x)$$be a polynomial of degree$$3$$satisfying$$p(-1)=10, p(1)=-6$$and$$p(x)$$has maxima at$$x=-1$$and$$p'(x)$$has minima at$$x=1$$. ... Using Rolle's theorem, prove that there is at least one root in$$\left( {{{45}^{1/100}},46} \right)$$of the polynomial$$P\left( x \right) = 51{x^...
Prove that for $$x \in \left[ {0,{\pi \over 2}} \right],$$ $$\sin x + 2x \ge {{3x\left( {x + 1} \right)} \over \pi }$$. Explain the identity if any ...
Using the relation $$2\left( {1 - \cos x} \right) < {x^2},\,x \ne 0$$ or otherwise, prove that $$\sin \left( {\tan x} \right) \ge x,\,\forall x \i... Find a point on the curve$${x^2} + 2{y^2} = 6$$whose distance from the line$$x+y=7$$, is minimum. If the function$$f:\left[ {0,4} \right] \to R$$is differentiable then show that (i)$$\,\,\,\,\,$$For$$a, b\,\, \in \left( {0,4} \right),{...
If $$P(1)=0$$ and $${{dp\left( x \right)} \over {dx}} > P\left( x \right)$$ for all $$x \ge 1$$ then prove that $$P(x)>0$$ for all $$x>1$$....
Let $$- 1 \le p \le 1$$. Show that the equation $$4{x^3} - 3x - p = 0$$ has a unique root in the interval $$\left[ {1/2,\,1} \right]$$ and identify ...
Suppose $$p\left( x \right) = {a_0} + {a_1}x + {a_2}{x^2} + .......... + {a_n}{x^n}.$$ If $$\left| {p\left( x \right)} \right| \le \left| {{e^{x - 1}... A curve$$C$$has the property that if the tangent drawn at any point$$P$$on$$C$$meets the co-ordinate axes at$$A$$and$$B$$, then$$P$$is the ... Suppose$$f(x)$$is a function satisfying the following conditions (a)$$f(0)=2,f(1)=1$$, (b)$$f$$has a minimum value at$$x=5/2$$, and (c) for all... Let$$a+b=4$$, where$$a<2,$$and let$$g(x)$$be a differentiable function. If$${{dg} \over {dx}} > 0$$for all$$x$$, prove that$$\int_0^a {...
Let $$f\left( x \right) = \left\{ {\matrix{ {x{e^{ax}},\,\,\,\,\,\,\,x \le 0} \cr {x + a{x^2} - {x^3},\,x > 0} \cr } } \right.$$ Where...
A curve $$y=f(x)$$ passes through the point $$P(1, 1)$$. The normal to the curve at $$P$$ is $$a(y-1)+(x-1)=0$$. If the slope of the tangent at any po...
Determine the points of maxima and minima of the function $$f\left( x \right) = {1 \over 8}\ell n\,x - bx + {x^2},x > 0,$$ where $$b \ge 0$$ is a ...
Let $$(h, k)$$ be a fixed point, where $$h > 0,k > 0.$$. A straight line passing through this point cuts the possitive direction of the coordina...
The curve $$y = a{x^3} + b{x^2} + cx + 5$$, touches the $$x$$-axis at $$P(-2, 0)$$ and cuts the $$y$$ axis at a point $$Q$$, where its gradient is $$3... The circle$${x^2} + {y^2} = 1$$cuts the$$x$$-axis at$$P$$and$$Q$$. Another circle with centre at$$Q$$and variable radius intersects the first ... Find the equation of the normal to the curve$$y = {\left( {1 + x} \right)^y} + {\sin ^{ - 1}}\left( {{{\sin }^2}x} \right)$$at$$x=0$$Let$$f\left( x \right) = \left\{ {\matrix{ { - {x^3} + {{\left( {{b^3} - {b^2} + b - 1} \right)} \over {\left( {{b^2} + 3b + 2} \right)}},} & ...
A cubic $$f(x)$$ vanishes at $$x=2$$ and has relative minimum / maximum at $$x=-1$$ and $$x = {1 \over 3}$$ if $$\int\limits_{ - 1}^1 {f\,\,dx = {{14}... What normal to the curve$$y = {x^2}$$forms the shortest chord? In this questions there are entries in columns$$I$$and$$II$$. Each entry in column$$I$$is related to exactly one entry in column$$II$$. Write th... A window of perimeter$$P$$(including the base of the arch) is in the form of a rectangle surmounded by a semi circle. The semi-circular portion is f... Show that$$2\sin x + \tan x \ge 3x$$where$$0 \le x < {\pi \over 2}$$. A point$$P$$is given on the circumference of a circle of radius$$r$$. Chord$$QR$$is parallel to the tangent at$$P$$. Determine the maximum possi... Find all maxima and minima of the function$$\$y = x{\left( {x - 1} \right)^2},0 \le x \le 2$$Also determine the area bounded by the curve$$y = x{\...
Investigate for maxima and minimum the function $$f\left( x \right) = \int\limits_1^x {\left[ {2\left( {t - 1} \right){{\left( {t - 2} \right)}^3} ... Find the point on the curve$$\,\,\,4{x^2} + {a^2}{y^2} = 4{a^2},\,\,\,4 < {a^2} < 8$$that is farthest from the point$$(0, -2)$$. Find all the tangents to the curve$$y = \cos \left( {x + y} \right),\,\, - 2\pi \le x \le 2\pi ,$$that are parallel to the line$$x+2y=0$$. Let$$f\left( x \right) = {\sin ^3}x + \lambda {\sin ^2}x, - {\pi \over 2} < x < {\pi \over 2}.$$Find the intervals in which$$\lambda $$sho... Show that$$1+xIn\left( {x + \sqrt {{x^2} + 1} } \right) \ge \sqrt {1 + {x^2}} $$for all$$x \ge 0$$Find the coordinates of the point on the curve$$y = {x \over {1 + {x^2}}}$$where the tangent to the curve has the greatest slope. If$$f(x)$$and$$g(x)$$are differentiable function for$$0 \le x \le 1$$such that$$f(0)=2$$,$$g(0)=0$$,$$f(1)=6$$;$$g(1)=2$$, then show that th... If$$a{x^2} + {b \over x} \ge c$$for all positive$$x$$where$$a>0$$and$$b>0$$show that$$27a{b^2} \ge 4{c^3}$$. Use the function$$f\left( x \right) = {x^{1/x}},x > 0$$. to determine the bigger of the two numbers$${e^\pi }$$and$${\pi ^e}$$Let$$x$$and$$y$$be two real variables such that$$x>0$$and$$xy=1$$. Find the minimum value of$$x+y$$. For all$$x$$in$$\left[ {0,1} \right]$$, let the second derivative$$f''(x)$$of a function$$f(x)$$exist and satisfy$$\left| {f''\left( x \right)...
Prove that the minimum value of $${{\left( {a + x} \right)\left( {b + x} \right)} \over {\left( {c + x} \right)}},$$ $$a,b > c,x > - c$$ is $${... ## Fill in the Blanks Let$$C$$be the curve$${y^3} - 3xy + 2 = 0$$. If$$H$$is the set of points on the curve$$C$$where the tangent is horizontal and$$V$$is the set ... Let$$P$$be a variable point on the ellipse$${{{x^2}} \over {{a^2}}} + {{{y^2}} \over {{b^2}}} = 1$$with foci$${F_1}$$and$${F_2}$$. If$$A$$is ... The set of all$$x$$for which$$in\left( {1 + x} \right) \le x$$is equal to .......... The larger of$$\cos \left( {In\,\,\theta } \right)$$and$$In \left( {\cos \,\,\theta } \right)$$If$${e^{ - \pi /2}} < \theta < {\pi ...
The function $$y = 2{x^2} - In\,\left| x \right|$$ is monotonically increasing for values of $$x\left( {x \ne 0} \right)$$ satisfying the inequalities...

## True or False

For $$0 < a < x,$$ the minimum value of the function $$lo{g_a}x + {\log _x}a$$ is $$2$$.
If $$x-r$$ is a factor of the polynomial $$f\left( x \right) = {a_n}{x^4} + ..... + {a_0},$$ repeated $$m$$ times $$\left( {1 < m \le n} \right)$$,...
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