$-p-11+3$
$\frac{dy}{dx}=\frac{4}{x^2-4}$
$\frac{25a}{5a}$
$\int\frac{4x^2+2x-1}{x^2\left(x+1\right)}dx$
$\frac{y'}{y}=\frac{x+1}{x^20121}$
$-2x=-2x^2+4$
$sqrt\left(x^2\:-\:1\right)\:=\:sqrt\left(x\:+\:2\right)$
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