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If f(x)=cosxcos2xcos4xcos8xcos16x," then...

If `f(x)=cosxcos2xcos4xcos8xcos16x," then "f'((pi)/(4))` is

A

`sqrt2`

B

`(1)/(sqrt2)`

C

1

D

`(sqrt3)/(2)`

Text Solution

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The correct Answer is:
A
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