$\frac{-4x^3+2x-5}{3x^2+4}$
$\int cos\left(4x-\frac{\pi}{4}\right)dx$
$-494+\left(-4\right)$
$\frac{x-3}{2}=\frac{x+1}{3}$
$81y^2-18xy+x^2$
$\left(10x+30y\right)\:\left(-3x\:-\:12y\right)$
$\lim_{x\to\infty}\left(\frac{\sqrt{3x+3}-3}{x^2-4}\right)$
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