$\frac{1}{cot^2\left(y\right)+1}$
$\frac{dy}{dx}\left(\frac{x-7}{x+2}\right)$
$x\int\left(\sec\left(x\right)\tan\left(x\right)\right)dx$
$60x^2-120xy+100y^2$
$\int_0^7\left(2\pi\right)\left(7-x\right)e^{-2x}dx$
$x^3+40x^2$
$-4x+3y+x-2z+3y$
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