$4x^2-12xn+9n^2$
$\lim\:_{x\to\:\infty\:\:}\left(\frac{2x+1}{2x}\right)^{5x+3}$
$2a-2b\:$
$\int\left(4e^x-a^{-x}\right)dx$
$\frac{3b}{2a}\cdot\frac{8ab}{15b^5}$
$\left(\frac{1}{4}xy^3-w^5+\frac{2}{3}\right)\left(-2y^4w\right)$
$\int\left(x^2e^{-2x+1}\right)dx$
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