If tan beta=cos theta tan alpha, then pr...

If `tan beta=cos theta tan alpha`, then prove that `tan^(2)""(theta)/(2)=(sin(alpha-beta))/(sin(alpha+beta))`.

A

`(sin (alpha + beta))/(sin (alpha + beta ))`

B

`(cos (alpha - beta))/( cos (alpha + beta ))`

C

`(sin (alpha - beta))/( sin ( alpha - beta))`

D

`(cos (alpha + beta ))/( cos (alpha - beta))`

Verified by Experts

The correct Answer is:

C

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