$\left(\:3ab^2\:-\:5xy\right)^3$
$\left(5a-\frac{2}{3}\right)^2$
$\left(3\:tan^2x-1\right)\left(tan^2x-3\right)=0$
$3xy^2-y^2=2x^2-2$
$\left(4\sqrt{2x+3}\right)^2$
$\frac{12^2-1}{x^3-1}$
$5^2-1^{10}$
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