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Find the integral of 1/(x^(2)+a^(2)) w.r...

Find the integral of `1/(x^(2)+a^(2))` w.r.t x and hence evaluate `int1/(x^(2)+2x+2)dx`.

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The correct Answer is:
`thereforeintdx/((x+1)^(2)+1)=tan^(-1)(x+1)+C`
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