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

If `f(x) = cos x cos 2x cos 4x cos 8x cos 16 x ` then `f^1((pi)/(4))` equals

A

`sqrt(2)`

B

`0`

C

`1/(sqrt(2))`

D

`"Cosec" pi/4`

Text Solution

Verified by Experts

The correct Answer is:
B
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