$9x^2-1x+36$
$\frac{-19x^2-6x^3+20}{x^2-2x-3}$
$8a^3+216y^3$
$\lim_{x\to0}\left(\frac{1-\cos\left(18x\right)}{1-cos\left(9x\right)}\right)$
$\sin^2\left(x\right)\tan^4\left(x\right)$
$\frac{x}{\sqrt[2]{16-x^2}},x=4\cos\left(x\right)$
$4sinx+7cosy=6$
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