$\frac{-3x^4+x^2-x+3}{x-3}$
$\lim_{x\to-\infty}\left(\frac{10x^2+3}{5x^2-2x+1}\right)$
$\cos2x=\sin x-1$
$x^2-3x-20$
$\left(3x+1\right)^2\:$
$2x+9=x+2$
$cot\left(y\right)=cot\left(\frac{1}{x}\right)$
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