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1/2tan(alpha/2)+1/4tan(alpha/4)+1/8tan(a...

`1/2tan(alpha/2)+1/4tan(alpha/4)+1/8tan(alpha/8)....1/2^ntan(alpha/2^n) +cotalpha`

A

`(1)/(2^(n))tan""(alpha)/(2^(n))`

B

`(1)/(2^(n))cot""(alpha)/(2^(n))`

C

`(1)/(2^(n-1))tan""(alpha)/(2^(n))`

D

`(1)/(2^(n-1))cot""(alpha)/(2^(n))`

Text Solution

Verified by Experts

The correct Answer is:
B
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