$\left(5x^2y+\frac{1}{3}x^3y^2\right)^2$
$-x^2-7x-4$
$cos4x\:+\:cos2xsin2x\:=\:cos2x$
$ab+4ab$
$\left(x+5\right)^2+\left(x+2\right)^2-2\left(2-x\right)^2$
$\int\left(\frac{x^2}{x^2-81}\right)dx$
$90\:=x\:^2\:-\:9x\:+108$
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