$4\cos\left(x\right)=1+2\cos\left(x\right)$
$3m+15m-8mn$
$2x=y^2$
$\frac{4x-2}{3}<1$
$\cos\left(y\right)+2=2x$
$\lim_{x\to1}\left(\frac{2+x-2x^3-x^4}{x-1}\right)$
$\frac{3x}{x+1}\ge1$
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