Functions Question 183

Question: The function $ y,=,|\sin x| $ is continuous for any x but it is not differentiable at

[AMU 2000]

Options:

A) $ x=0 $ only

B) $ x=\pi $ only

C) $ x=k,\pi ,(k $ is an integer) only

D) $ x=0 $ and $ x=k,\pi ,(k $ is an integer)

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Answer:

Correct Answer: D

Solution:

It can be easily seen from the graph of $ f(x)=,|\sin x| $ that it is every where continuous but not differentiable at integer multiples of $ \pi $ and at $ x=0 $ .