$\frac{5}{x}+\frac{1}{x^2+x}$
$y\left(\frac{d^2y}{dt^2}\right)=\left(\frac{dy}{dt}\right)^2$
$\frac{dy}{dx}=\frac{1}{2y}-\frac{1}{2\left(y-2\right)}$
$c+d^2-18c-18d+65$
$57^2$
$\frac{x^{10}-y^8}{x^5-y^4}$
$\lim_{x\to-\infty}\left(\frac{7x-5}{\sqrt{x^2+1}}\right)$
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