$x\left(\frac{dy}{dx}\right)-y-3x^2=0$
$-3+4\cdot\left(2-6:\left(-2\right)+2\cdot4-5\right)$
$25.3-50432.6+0.0025+7$
$\sin\left(\frac{3\pi}{2}-m\right)=-\cos\left(m\right)$
$\frac{6r^4}{r}$
$-2x^2+5\cdot2x-1$
$\frac{2}{x+2}\:-\frac{5}{x+3}$
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