$\frac{x^2-x-2}{2x+1}$
$\frac{1-cos2x}{1+cos2x}=cos^2x$
$-3\left(4-10-3\right)-\left(2+15-23\right)$
$49-\left(-44\right)$
$ydx+\left(x-ye^y\right)dy=0$
$4c^2+3c^2-4c$
$y^3=x^2+2x+1$
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