$\lim_{x\to0}\left(\frac{2-2\cos\left(x\right)}{x^2}\right)$
$ylnx\:-x\:\frac{dy}{dx}\:=0$
$\frac{dy}{dx}=\left(\frac{\:2y+5}{8x+7}\right)^2$
$5x^2=125$
$\int\frac{1}{\left(x+9\right)\left(x+7\right)}dx$
$\frac{dy}{dx}-2xy^2=2x$
$\frac{dx}{dy}+\frac{4x}{y}=y^2-1$
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