$-5\left(3\left(-2\right)+2\left(6\right)-8\left(-2\right)+5\left(6\right)+3\left(-2\right)-6\right)$
$\left(x^2y+x^2-y-1\right)dx=xydy$
$\int x\sqrt{36-81x^2}dx$
$4x^4-9x^2-6x-1$
$\int\left(x\:arctan\left(\sqrt{x}\right)\right)dx$
$20+90+51\cdot$
$3m-m^2n$
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