$\int\:\frac{t\arctan\:\left(t\right)}{\sqrt{1+t^2}}dt$
$sin\left(x\right)\left(cot\left(x\right)+tan\left(x\right)\right)=sec\left(x\right)$
$18m^2n^2-21m^3n$
$\left(-4y+7z\right)\left(-4y-8z\right)$
$\left(x\:^3\:+3\right)\left(x\:^3\:+2\right)$
$3x^3-4x^2-59x+20$
$x^2-4y^2$
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