$\frac{dx}{dy}=5+y^2$
$\lim_{x\to+infity}\left(\frac{1-\cos\left(x\right)}{x^2}\right)$
$\left(x-3\right)\left(x-2\right)\left(x-1\right)x$
$x+2+6x$
$x\:-\:4\:=\:2x\:+\:9$
$-\frac{4}{18}w^2y$
$28nb+7nb-12nb-3nb$
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