$x\left(x+2\right)-12\left(x+2\right)$
$u^4-2u^2+1$
$\left(\frac{a^4b^5}{a^{-2}b^{10}}\right)^2$
$y=\arcsec\left(x^2+2x+1\right)$
$\lim_{x\to-4}\left(\frac{x^2+6x+9}{x+3}\right)$
$36a^2+60ab+25b^2$
$xy'+y=x+x^3$
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