$3x^2-6+2x\ge0$
$3x+4\cdot3x-4$
$x^2-6x+11$
$\frac{9+x^4}{3+x^2}$
$1245\cdot72$
$y^{'\:}+6y=e^{4t}$
$\frac{dy}{dx}=\frac{x-4}{3y}$
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