JEE Advanced 2020 Full Test 4 Paper 2

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Question : 42 of 54

Marks: +1, -0

Which of the following functions are twice differentiable at x=0?

f(x)=x|x|
g(x)=[x2]tan−1x−{x2}cot−1x−[x2]‌
π
2
h(x)=|sin2x|
h(x)={
x4‌cos(‌
1
x
)
‌ x≠0
0 ‌
x=0.

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