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The value 2tan^(-1)[sqrt((a-b)/(a+b))tan...

The value `2tan^(-1)[sqrt((a-b)/(a+b))tantheta/2]` is equal to `cos^(-1)((acostheta+b)/(a+bcostheta))` (b) `cos^(-1)((a+bcostheta)/(acostheta+b))` `cos^(-1)((acostheta)/(a+bcostheta))` (d) `cos^(-1)((bcostheta)/(acostheta+b))`

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