$\left(-3x^2y-2xy^2-xy\right)\left(x^2-y^2\right)$
$a^4-25+10a^2$
$\sqrt{-729}$
$\frac{y^3-216}{y-6}$
$\frac{\sec a}{\csc a}=\tan a$
$4\log\left(m^2n^2\right)$
$\lim_{z\to0}\:\frac{x^2-2x}{x}$
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