$\frac{-x^2+8x-15}{x^2-9x+20}$
$1\:+\:a\:+\:3a\:+\:3b$
$\left(-\frac{2}{3}x^2+\frac{1}{5}x-3\right)\left(\frac{3}{4}x^2-x+\frac{3}{2}\right)$
$\left(a-2\right)\left(a-10\right)$
$\int\:e^{kx}\:dx$
$\sqrt{9x^2}y^6$
$\log_{x+4}\left(3x^2+16\right)=2$
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