$\int\frac{x^4}{x^4-81}dx$
$\left(x+7\right)\left(x-5\right)-\left(x+2\right)^2$
$14xy+10x+42y+30+14xy-12x+42y-36$
$\left(2x^2-\:6\right)^2$
$-6sqrt\left(28a^5b^4\right)$
$\frac{a^2-3a^2-6}{a+3}$
$-16sin4x=0$
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