$-3m^3-7m^3$
$\left(\frac{3}{4}a^4-2\right)\left(\frac{3}{4}a^4+18\right)$
$6x^2-2x+5x-3y^2$
$\frac{m^{-3}n^9}{m^6n^{12}}$
$\lim_{x\to0}\left(\frac{2\cos^2\left(x\right)}{1+\cos\left(2x\right)}\right)$
$-5m\left(1-5m\right)-4\left(2m+5\right)$
$\frac{\cos\left(90+x\right)}{\sin\left(-x\right)}-\frac{\tan\left(-x-180\right)}{\tan\left(360+x\right)}$
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