$\int x^3e^{-x}\sin\left(x\right)dx$
$\frac{x^3+4x^2-5x^1+8}{x^2-2x+a}$
$-20ab+11+6ab$
$2x-5=4x+9$
$x^2-2x=1$
$0=\cos\left(x\right)-\sin\left(2x\right)$
$\lim_{x\to-\infty}\left(\frac{x^2+\cos\left(x\right)}{e^{1-x}}\right)$
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