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2Tan^(-1)((sqrt(a-b))/(a+b)"tan"x/2)=...

`2Tan^(-1)((sqrt(a-b))/(a+b)"tan"x/2)=`

A

`Cos^(-1)((a cos theta+b)/(a+b cos theta))`

B

`Cos^(-1)((a cos theta-b)/(a-b cos theta))`

C

`Cos^(-1)((a+b cos theta)/(acos theta +b))`

D

`Cos^(-1)((a-b cos theta)/(acos theta -b))`

Text Solution

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The correct Answer is:
A
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