#### Question

Prove that :

`2 tan^-1 (sqrt((a-b)/(a+b))tan(x/2))=cos^-1 ((a cos x+b)/(a+b cosx))`

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#### Reference Material

Solution for question: Prove that : 2 tan^−1(√(a−b/a+b) tan(x2))=cos^−1(acosx+ba+bcosx) concept: Inverse Trigonometric Functions (Simplification and Examples). For the courses CBSE (Arts), CBSE (Commerce), CBSE (Science)