$x^2+18x+81x\:2\:+18x+81$
$\frac{1}{cot\:1.2079856}$
$10\left(x-3\right)-12x=-4x\left(x-3\right)$
$\frac{x^4+1}{x^2-2x}$
$10e^x+xe^x-2\left(9e^x+xe^x\right)+\left(8e^x+xe^x\right)$
$\left(-105\right)+\left(-420\right)+\left(+156\right)+\left(+224\right)$
$9r-17=19$
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