$-4v\:+\:-8\:+\:9\:+\:-v\:-\:6v$
$\lim_{x\to0}\left(\ln\left(3x\right)-\ln\left(\sin\left(x\right)\right)\right)$
$\left(x^2-1\right)e^2$
$\frac{2x^2-4x+6}{x^2+2x}$
$4\left(x+3\right)\left(y-1\right)$
$\int\frac{1}{x^2\sqrt{49+x}}dx$
$\left(\sin^2x-\cos^2x\right)\left(1-2\sin2x\cdot\cos\left(2x\right)\right)$
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