Question
$\int(1+x)\left(1+x^2\right)(1-x) d x$ का मान ज्ञात कीजिए।

Answer

$\int(1+x)\left(1+x^2\right)(1-x) d x$
$\Rightarrow \int(1+x)(1-x)\left(1+x^2\right) d x$
$\Rightarrow \int\left(1-x^2\right)\left(1+x^2\right) d x$
$\Rightarrow \int\left(1-x^4\right) d x=\int d x-\int x^4 d x$
$\Rightarrow x-\frac{x^5}{5}+ C$

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