$7-2-\left(-19\right)$
$9x^20$
$\frac{x^2+2^2-2x+2}{\left(x+2\right)\left(x+4\right)}$
$-6x^2+11x-6$
$\int\frac{1}{4-3x^2}dx$
$\frac{dy}{dx}=-3e^{x+2y}$
$4\cot x^2+4\cot x+1$
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