1

### IIT-JEE 1988

Subjective
Investigate for maxima and minimum the function $$f\left( x \right) = \int\limits_1^x {\left[ {2\left( {t - 1} \right){{\left( {t - 2} \right)}^3} + 3{{\left( {t - 1} \right)}^2}{{\left( {t - 2} \right)}^2}} \right]} dt$$\$

min at $$x = {7 \over 5}$$
max at $$x = 1$$.
2

### IIT-JEE 1987

Subjective
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 $$(0, -2)$$.

$$(0, 2)$$
3

### IIT-JEE 1985

Subjective
Let $$f\left( x \right) = {\sin ^3}x + \lambda {\sin ^2}x, - {\pi \over 2} < x < {\pi \over 2}.$$ Find the intervals in which $$\lambda$$ should lie in order that $$f(x)$$ has exactly one minimum and exactly one maximum.

$$\lambda \in \left( { - {3 \over 2},0} \right) \cup \left( {0,{3 \over 2}} \right)$$
4

### IIT-JEE 1985

Subjective
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 $$x+2y=0$$.

$$2x + 4y - \pi = 0$$
$$2x + 4y + 3\pi = 0$$

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Class 12