Let f(n)(theta)= tan""(theta)/2(1+secthe...

Let `f_(n)(theta)= tan""(theta)/2(1+sectheta)(1+sec2theta)(1+sec4theta).....(1+sec2^(n) theta)` ,then `f_(2)(pi/16)+f_(3)((pi)/32)+f_(4)(pi/64)+f_5(pi/128) =`

A

0

B

2

C

4

D

8

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The correct Answer is:

B

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