$2\cdot a-4$
$4x+10x-3$
$\int\left(-2x^2\right)\cdot\sin\left(4x\right)dx$
$\lim_{x\to\infty}\left(\frac{x^2-4}{x-2}\right)$
$\log\left(4\right)x+3\log\left(x\right)$
$\frac{ds}{dr}\:=\:s$
$\left(a+3\right)\left(9a+1\right)$
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