$13\cot^2\left(x\right)-\frac{1}{\sin^2\left(x\right)}=1$
$\frac{\sin\left(2x\right)\cos\left(x\right)+\sin\left(x\right)^3}{\cos\left(x\right)^2}$
$\left(-x^2-y^2\right)^3$
$144x^2-256y^4$
$5^25^3$
$\lim_{x\to2}\left(\frac{\cos\left(x\right)-\cos\left(2x\right)}{x^3}\right)$
$a2\:+\:12a\:+\:36^2$
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