$t^2+2y\left(t\right)-t\left(y\right)^'\left(t\right)=0$
$\left(x^2+3x-1\right)+\left(-x^2-4x+3\right)$
$x^2\cdot y'=y^2-2\cdot x^2$
$4x^2-64=0$
$x^2+5x-3\le0$
$\:\left(7x-3\right)\left(7x+3\right)$
$\left(\frac{1}{3}s-2\right)^2$
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