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If f(x)=|cos x|, then f' ((3pi)/(4)) is ...

If `f(x)=|cos x|, then f' ((3pi)/(4))` is equal to

A

`(1)/(sqrt2)`

B

`sqrt2`

C

`(1)/(2)`

D

`2sqrt2`

Text Solution

Verified by Experts

The correct Answer is:
A
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