$\left(xsec\left(\frac{y}{x}\right)-y\right)dx+xdy=0$
$3x^2+x-10=0$
$y=\frac{1}{\sqrt{3u^3}}$
$y''-2y'-2y=0$
$\lim_{x\to\infty}\left(\frac{e^{5x}}{e^{cosx}}\right)$
$\frac{a+1^3}{a+1}.$
$9\cdot z=18$
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