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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

`sqrt2`

B

`1/(sqrt2)`

C

1

D

`(sqrt3)/(2)`

Text Solution

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The correct Answer is:
A
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