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

Find the integral of `(1)/(x^(2) + a^(2))` w.r.t.x and hence evaluate `int (1)/(x^(2) + 2x + 3)` dx.

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The correct Answer is:
`tan^(-1) `(x + 1) + C
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