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If y=sin^(-1)((1-x^2)/(1+x^2)) , then (d...

If `y=sin^(-1)((1-x^2)/(1+x^2))` , then `(dy)/(dx)=` (a)`-2/(1+x^2)` (b) `2/(1+x^2)` (c) `1/(2-x^2)` (d) `2/(2-x^2)`

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