$\frac{d^2}{dx^2}\:\frac{2x+1}{x^2+x-2}$
$y=\frac{2}{3}x^3+\frac{2}{3}x^2-5x+9$
$2x^3+3x^2-x+2$
$a^3c^2+ac^2$
$f\left(t\right)=\left(\frac{1}{t-3}\right)^2$
$\left(mn+n^2\right)^2$
$\lim_{x\to1}\left(x-1\right)^3\left(1-x\right)^{-2}$
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