$\cot\left(x\right)-\csc\left(x\right)=3$
$3\cdot39$
$tan-3x^{-2}$
$\frac{x^3-32x^2+55}{x+5}$
$ab\left(a^2-9\right)\left(a^2+9\right)$
$\frac{dy}{dx}=xe^ye^{-x^2}$
$x^2-2-2\cdot x-2\cdot2$
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