$\frac{5x^2+3x-15}{\left(x-2\right)\left(x+2\right)}$
$\lim_{x\to3}\left(\frac{x+1}{x^2-6x+9}\right)$
$\frac{d}{dx}y=4x^3+e^{-2x}$
$\frac{1}{3-x}+4$
$\int\frac{\left(x^2\right)}{\left(x-1\right)\left(x^2+2x+1\right)}dx$
$x-4=-34$
$lncos6x$
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