$\frac{x^4-\:y^4}{x-y}$
$6x^{2}-xy-2y^{2}\cdot\frac{12x+y}{3}$
$81x^2-16x^6$
$5p+9<2p+6$
$\left(a+1\right)\left(a-1\right)\left(x+a^3\right)$
$x+\:y\:=\:20$
$\sin\left(x\right)=\tan\left(\frac{x}{2}\right)$
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