$( 3 + y ^ { 2 } ) \cdot ( 3 x - y ^ { 2 } )$
$\left(k^2+k\right)^2$
$\lim_{x\to\infty}\left(\sqrt{x^2+2x+3}-\sqrt{x^2-2x+3}\right)$
$y'=e^x+y-e^{-x}y^2$
$\frac{\left(-1\right)^kx^k}{5^k}$
$x^2-9x-220$
$4.534+5.2$
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