$\frac{x-91}{\sqrt{x}-\sqrt{91}}$
$\left(51x^3+70x^2+97x+90\right)\left(3x+2\right)$
$\frac{\left(n+1\right)\cdot\:\left(-3\right)^2}{\left(2n+1\right)\cdot2^n}$
$\frac{6}{x+2}=\frac{8}{x}$
$-9m\:+2mn\:+\:7n\:+\:6m-\:9mn\:+\:3n$
$\frac{a}{a}$
$\frac{-1+4cosx}{2sin^2x}$
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