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If f(x) = cos x cos 2x cos 4x cos (8x). ...

If `f(x) = cos x cos 2x cos 4x cos (8x). cos 16x` then find `f' (pi/4)`

A

`sqrt(2)`

B

`1/(sqrt(2))`

C

1

D

none of these

Text Solution

Verified by Experts

The correct Answer is:
A
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