if f(x) = cos x cos 2x cos 4x cos ...

if f(x) = cos x cos 2x cos 4x cos 8 x cos 16 x , then ` f' (pi //4)` is

A

1

B

`sqrt2`

C

`1/(sqrt2)`

D

0

Text Solution

Verified by Experts

The correct Answer is:

B

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