$27a^3b^2c+9ab^3c^2$
$t^2y'\:+\:ty\:=\:2\:$
$\lim_{z\to i}\left(\frac{iz^3-1}{z+i}\right)$
$18x^2y+3y$
$30x^5-30x^4$
$\left(5x^2-8x+15\right)+\left(2x^2+4x-11\right)$
$\int_0^{\infty}\left(\frac{x+2}{x^3-x}\right)dx$
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