$2\cos^2x-1=1-2\sin^2$
$90+x=5x+10$
$5x+3=-27$
$200mn^2n-50mn^2$
$36a^4-6a^2b+\frac{b^2}{4}$
$-12x^8\:\cdot\left(3x^2\right)$
$\lim_{x\to0}\left(\frac{\sin\left(x\right)\sin\left(x\right)}{x}\right)$
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