$\left(2mn+2\right)^2$
$x^2+9>0$
$\frac{dy}{dx}=\frac{2xy}{x^2+1}+x^3$
$-\frac{\pi}{6}+\frac{3\pi}{2}$
$0=\cos\left(x\right)-\sin\left(2x\right)$
$2x-7<4$
$4x-4+4x-4$
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