$-5r\:\:+\:-2r$
$4x^2-22x-12$
$\lim_{x\to n}\left(\frac{x+4n}{x^2}\right)$
$\frac{1}{sec^2\left(a\right)-1}$
$\lim_{x\to infinity}\left(\frac{\left(ln\left(x^8-4\right)\right)}{ln\left(x\right)\cdot cos\left(\frac{1}{x}\right)}\right)$
$4x^2+3x+2x^2+x$
$x^4-25x^2+144$
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