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If f(n)(x)=(sinx)/(cos3x)+(sin3^2x)/(cos...

If `f_(n)(x)=(sinx)/(cos3x)+(sin3^2x)/(cos3^2x)+(sin3^2x)/(cos3^(3)x)+....+(sin3^(n-1)x)/(cos3^(n)x)` Then `f_(2)(pi//4)+f_3(pi//4)=`

A

0

B

1

C

`-1`

D

2

Text Solution

Verified by Experts

The correct Answer is:
C
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