$\sec\left(x\right)-\cos\left(x\right)=\frac{1}{\csc\left(x\right)\:\cot\left(x\right)}$
$\left(-xy^2\right)\left(-4x^2y^2+4xyz+4z\right)$
$2x^4\:+\:6x^3\:+\:4x^2$
$\frac{x^2+7x^0+2}{x^0-3}$
$xy=2+x$
$x\sqrt{2x}$
$\frac{-25x^3+35x^2+40x}{5x^3}$
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