$\lim_{x\to-3}\left(\frac{x^2-x-12}{x^2+9}\right)$
$4x-3xy^2+x^2y=0$
$2x^2-5x^2+2r-12i$
$x^2+2x-15\le0$
$\left(ab\right)^2\left(ab\right)^3$
$\left(-10\right)^6+\left(-10\right)^4$
$x\left(1+y^2\right)^{\frac{1}{3\:}}dx=y\left(1+x^2\right)^{\frac{1}{3}}dy$
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