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If tan ((theta)/(2))= sqrt((1-e)/(1+e)) ...

If `tan ((theta)/(2))= sqrt((1-e)/(1+e)) tan(( alpha)/(2))` then `cos alpha=`

A

`(1-e cos theta)/(cos theta+e)`

B

`(1+e cos theta)/(cos theta+e)`

C

`(cos theta-e)/(1-e costheta)`

D

`(1-e cos theta)/(cos theta-e)`

Text Solution

Verified by Experts

The correct Answer is:
C
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