$1+y^2dy=-xdx$
$\left(e^x+1\right)^2e^xdx+\left(e^y+1\right)^3e^ydy=0$
$\frac{x^2-1}{x^2+2}$
$f\left(x\right)=\left(2x^2+3\right)\left(\sqrt{x}-2\right)$
$\left(\frac{1}{2}y^2-\frac{1}{2}y^{-2}\right)^2$
$4x+10\ge2$
$x^3+5x^2+6x$
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