$\left(x^2-1\right)y^3dx+x^2dy$
$y^2-8y+15$
$\frac{1}{2}xy^3+\frac{5}{6}xy^3+\frac{4}{3}xy^3$
$x^2-2x-7>5-x$
$sec\:x\:=\:8$
$y=2e^{3x}+1\frac{dy}{dx}\left(3y-3\right)$
$sen2\theta\:\:-cos\theta\:\:=0$
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