$f^2-5f+6$
$75.91-20.01$
$r^2+10r-25$
$\sqrt{\frac{x^2-9}{x^2+9}}$
$\int x\:tan^2\:x\:dx$
$\lim_{x\to0}\left(\frac{2tan\left(x\right)}{cos\left(x\right)-1}\right)$
$a^{-3}a^2$
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