$x^2y^'-2xy=x^2$
$-\left(-17-12\right)+\left(-30\right)$
$\lim_{t\to0}\left(\frac{x^2t+3xt^2+t^3}{2xt+5t^2}\right)$
$y'+y=5xy^3$
$\left\{3x-1\ge2\right\}$
$\frac{1}{1-\cos\left(y\right)}+\frac{1}{1+\cos\left(y\right)}$
$dx\left(1+x+x^2\right)+x\left(x^2-4\right)dy$
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