$-6\cos^2x+2\cos x+2=3\cos x$
$\frac{9m^2n}{-4mn^2}$
$\sqrt[3]{32x^4}$
$\lim_{x\to4}\left(-x^2+x-4\right)$
$\left(\frac{-6a^5b^9}{2a^7b^{-5}}\right)^3$
$0.2x=5$
$12x-y+5-9x+1$
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