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If f(x)=sqrt(1+cos^2(x^2)),thenf'(sqrtpi...

If `f(x)=sqrt(1+cos^2(x^2))`,then`f'(sqrtpi/2)` is

A

`sqrt pi/6`

B

`-sqrt(pi/6)`

C

`1/sqrt6`

D

`pi/sqrt6`

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The correct Answer is:
B
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