1.

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

Answer»

`(1-e COS THETA)/(cos theta+e)`
`(1+e cos theta)/(cos theta+e)`
`(cos theta-e)/(1-e COSTHETA)`
`(1-e cos theta)/(cos theta-e)`

ANSWER :C


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