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Find the sum of each of the following se...

Find the sum of each of the following series :(i) `tan^-1(1/(x^2+x+1))+tan^-1 (1/(x^2+3x+3))+tan^-1(1/(x^2+5X+7))+tan^-1(1/x^2+7x+13))`......upto n.

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The correct Answer is:
`tan^(-1)(x+n)-tan^(-1)x`
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  20. The sum of the infinte series sin^(-1)(1/sqrt(2))+sin^(-1)((sqrt(2)-1)...

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