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If f' (x) = sin x + sin 4 x * cos x " t...

If ` f' (x) = sin x + sin 4 x * cos x " then " f' ( 2 x ^(2) + (pi)/( 2))` at ` x = sqrt((pi)/( 2))` is equal to

A

0

B

`-1`

C

`- 2 sqrt( 2 pi)`

D

None of these

Text Solution

Verified by Experts

The correct Answer is:
C
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