$\left(-15\right)^3$
$\int\:\frac{u-u^2}{-u-u^3}du$
$e\frac{1+x}{1-x}$
$6=4+5y-2\left(5+2y\right)$
$1-2\sin^2a=2\cos^2a-1$
$\lim_{x\to1}\left(\frac{t-1}{t^2-1}\right)$
$\frac{4x^5+6}{2x^3+2}$
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