Question
$\int {\frac{{x\,\,dx}}{{{x^2} + 4x + 5}} = } $
प्रथम व्यंजक में [ $1 + {(x + 2)^2} = t$ रखने पर ==>$ 2(x +2)dx = dt$]
$ = \frac{1}{2}\log t - 2{\tan ^{ - 1}}(x + 2) + c$
$ = \frac{1}{2}\log ({x^2} + 4x + 5) - 2{\tan ^{ - 1}}(x + 2) + c$.
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