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" 8."quad " If "y=sin^(-1)((2x)/(1+x^(2)...

" 8."quad " If "y=sin^(-1)((2x)/(1+x^(2)))+sec^(-1)((1+x^(2))/(1-x^(2)))," prove that "(dy)/(dx)=(4)/(1+x^(2))

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