$\int_0^{\infty}\left(x\:e^{-\left(x+xy\right)}\right)dy$
$\frac{x^2}{4+2x}$
$\lim_{x\to-1}\left(\frac{12x^3+12x^2}{x^3-x^2}\right)$
$\frac{\sqrt{7}}{4}+cos^2t\:=\:1$
$4a^2-3a-a^2+5a$
$3\sqrt[4]{5^2}.m^2n^3p$
$-18-\left(-23\right)+45$
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