$7n-21$
$\int\frac{1}{\left(x+1\right)\left(1-x^2\right)}dx$
$\lim_{x\to\infty}\left(\frac{1}{x-2}-\frac{2+2x-x^2}{x^2-2x}\right)$
$\int\frac{1}{x\sqrt{x^2-5}}dx$
$6n^4\:-\:12n^2\:+\:6$
$x^4+x^2+116x^4y^2$
$\left(1-x\right)dy=y^2dx$
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