$\int\left(sec^2x\right)\left(tanx+e\right)dx$
$\frac{1}{1-cscx}-\frac{1}{1+cscx}=2tanxsecx$
$x^3-19x-30$
$\left(3.9\right)\cdot\left(-30.6\right)$
$\lim_{x\to1}\left(\frac{x^2+3x+2}{2}\right)$
$\int t\sqrt{t^2-2}dt$
$\int x\left(\sqrt{x}-4\right)dx$
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