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If y=tan^(-1)(1/(x^2+x+1))+tan^(-1)(1/(x...

If `y=tan^(-1)(1/(x^2+x+1))+tan^(-1)(1/(x^2+3x+3))+tan^(-1)(1/(x^2+5x+7))`+`.....` to n terms, show that `(dy)/(dx)=1/((x+n)^2+1)-1/(x^2+1)`

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