$\left(\frac{1}{x^8y^{12}}\right).\left(-xy\right)^6$
$\left(-2x^{-1}+2x^{-2}\right)^2$
$6t^3-2t^2-4$
$\left(10\:-\:x\right)\:.\:\left(10\:+\:x\right)$
$8x^2-24x+9$
$\sqrt{8}^2-2\sqrt{15}^2$
$\frac{2x^2+13x+15}{x+5}$
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