$\int x^{-1}\sqrt{\left(x-2\right)\left(x+2\right)}dx$
$81n^3m^4+61n^3m^4$
$\lim_{x\to6}\left(\frac{\sqrt{15-x}}{x-6}\right)$
$\left(x-6\right)\left(x-9\right)$
$4\cos^2x-2\cos x-2=0$
$\int\left(x+3\right)\left(\sqrt{x-3}\right)dx$
$5x-4x+18=3x+2$
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