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सिद्ध कीजिए कि tan[(1)/(2)sin^(-1)((...

सिद्ध कीजिए कि
`tan[(1)/(2)sin^(-1)((2a)/(1+a^(2)))+(1)/(2)cos^(-1)((1-a^(2))/(1+a^(2)))]=(2a)/(1-a^(2))`

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