$\cos\left(-x\right)+\frac{sin\left(-x\right)}{cot\left(-x\right)}$
$\frac{12x^{2}-4x}{2x}$
$7x-11\le4x$
$\left(+318\right)+\left(+146\right)+\left(+189\right)$
$2x^2-50=0$
$m^2-12m+20$
$\int\left(\frac{9e^x}{\sqrt{81-e^{2x}}}\right)dx$
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