$\frac{36}{4}-18$
$\int\frac{x}{\sqrt[3]{w^3}}dx$
$\lim_{x\to0}\left(\cos\left(e^{-x}\right)-1\right)$
$x^2\left(9x^2+4\right)+1$
$\left(4a-19y\right)^2$
$-\left(2y^4+x^4\right)dx-xy^3dy=0$
$5\:.\:\left(-7\:+\:3\right)\:-\:12\::\:\left(-4\right)\:+\:20\::\:\left(1-6\right)\:$
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