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The value of tan(theta/2)(1+sectheta)(1+...

The value of `tan(theta/2)(1+sectheta)(1+sec2theta)+(1+sec2^2theta)....(1+sec2^ntheta)` is

A

`tan2^(n)theta`

B

`tan2^(n-1)theta`

C

`tan2^(n+1)theta`

D

`tan2^(n-2)theta`

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The correct Answer is:
A
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