1.

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

Answer»

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

Answer :A


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