$\cot\left(x\right)+\left(\frac{1}{\sin\left(x\right)}\right)$
$\int_1^2\frac{1}{\sqrt{6x-x^2}}dx$
$\sec^2x\left(1-sin^2x\right)$
$-x\le0$
$\left(x^3-4\right)\left(x^3-5\right)$
$\frac{x^{3\:}+y^3}{x+y}$
$\int\frac{xd}{x^2+7x+6}$
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