$x^2-12x-19$
$2\cos\left(a\right)=-1$
$-\left(2\right)\left(2\right)+\left(-2\right)\left(1\right)+\left(-3^2\right)+\left(-3\right)\left(1\right)$
$\int\:\left(x^2+4\right)x\:dx$
$388-\left(9+\left(\left(-15\right)-\left(-8\right)\right)-17\right)+8+9$
$\frac{dy}{dx}-y=4e^x$
$3\left(2k+11\right)$
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