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For a positive integer n , fn(theta)=(ta...

For a positive integer n , `f_n(theta)=(tantheta/2)(1+sectheta)(1+sec2theta)(1+sec4theta)....(1+sec2^ntheta.)`, then

A

`f_(2)(pi/16)=0`

B

`f_(3) (pi/32)=-1`

C

`f_(4) (pi/64)=-1`

D

`f_(5)(pi/128)=1`

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