$\frac{5}{9}ab^3-2a^3b-1b^3a+8a^3b$
$12x^3y-30x^2y^2+42xy^4$
$\int\:\left(4x^7-2x^4+5x^2+8\right)dx$
$\frac{d^2}{dx^2}\left(tan\left(2x\right)\right)$
$-3\left(x-2\right)\le x+6$
$-5\le4-9<-2$
$\int\:\frac{x^3-1}{x\left(2x+1\right)\left(2x-1\right)}dx$
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