If sin-1 2a1+a2 + sin-1 2b1+b2 = 2 tan-1 x, prove that x = a+b1-ab

If $\sin^{- 1} \frac{2 a}{1 + a^{2}} + \sin^{- 1} \frac{2 b}{1 + b^{2}} = 2 \tan^{- 1} x$ , prove that $x = \frac{a + b}{1 - a b}$

Matching exercise

Match the items on the right to the items on the left.

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