$72x^2-x-1$
$\left(3m-6n\right)^3$
$\tan\left(x\right)^2=3\sec\left(x\right)-3$
$-16x^2y+-9x^2y$
$\left(4x^2-4x\right)^2$
$\:csc\:x\:sec\:x\:=\frac{csc\:x\:+\:sec\:x}{cos\:x\:+\:sin\:x}$
$\lim\:_{x\to\:2}\frac{\left(x-2\right)+\left(\sqrt{12x^2-12}\right)}{4x-7}$
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