$\frac{dy}{dx}\left(x^2-1\right)+x\left(y-9\right)$
$\frac{dx}{dy}+\frac{4x}{y}=y^2-1$
$100a^2+100a+25$
$\lim_{x\to0}\left(\frac{x}{\sqrt{1-x}-1}\right)$
$\int4x\sqrt{x-1}dx$
$-\left(\:-9\:+\:1\:\right)\:-\:\left(\:7\:-\:5\:\right)\:$
$-28x+49$
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