$\left(a+4\right)\left(a-15\right)$
$\lim_{x\to-\infty}\left(\frac{x\cdot sin\left(\frac{1}{x}\right)}{1}\right)$
$\left(5g^2m^3+4\right)^2$
$4x^2-8xy+16y^2$
$-3x\ge-18$
$16x^2-225y^2$
$\int t\:\cos\left(bt\right)\:dt$
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