1
JEE Main 2019 (Online) 12th January Morning Slot
+4
-1
Let S be the set of all points in (–$$\pi$$, $$\pi$$) at which the function, f(x) = min{sin x, cos x} is not differentiable. Then S is a subset of which of the following ?
A
$$\left\{ { - {\pi \over 2}, - {\pi \over 4},{\pi \over 4},{\pi \over 2}} \right\}$$
B
$$\left\{ { - {{3\pi } \over 4}, - {\pi \over 2},{\pi \over 2},{{3\pi } \over 4}} \right\}$$
C
$$\left\{ { - {\pi \over 4},0,{\pi \over 4}} \right\}$$
D
$$\left\{ { - {{3\pi } \over 4}, - {\pi \over 4},{{3\pi } \over 4},{\pi \over 4}} \right\}$$
2
JEE Main 2019 (Online) 11th January Evening Slot
+4
-1
Let K be the set of all real values of x where the function f(x) = sin |x| – |x| + 2(x – $$\pi$$) cos |x| is not differentiable. Then the set K is equal to :
A
{0, $$\pi$$}
B
$$\phi$$ (an empty set)
C
{ r }
D
{0}
3
JEE Main 2019 (Online) 11th January Evening Slot
+4
-1
$$\mathop {\lim }\limits_{x \to 0} {{x\cot \left( {4x} \right)} \over {{{\sin }^2}x{{\cot }^2}\left( {2x} \right)}}$$ is equal to :
A
0
B
4
C
1
D
2
4
JEE Main 2019 (Online) 11th January Morning Slot
+4
-1
Let $$f\left( x \right) = \left\{ {\matrix{ { - 1} & { - 2 \le x < 0} \cr {{x^2} - 1,} & {0 \le x \le 2} \cr } } \right.$$ and

$$g(x) = \left| {f\left( x \right)} \right| + f\left( {\left| x \right|} \right).$$

Then, in the interval (–2, 2), g is :
A
non continuous
B
differentiable at all points
C
not differentiable at two points
D
not differentiable at one point
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