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[" 16.If "y=tan^(-1)((2x)/(1-x^(2)))+sec...

[" 16.If "y=tan^(-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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