$\lim_{x\to2}\frac{\sqrt{x^2-4}}{x-2}$
$\left(2m^2+3n\right)^2$
$10\cos\:c+1=\cos\:c-1$
$-\frac{2}{5}bx^2-4bx^2$
$\left(-5x+3\right)-\left(-6x\right)+\left(-5x-2\right)-\left(-3x\right)$
$36x^2+120x+10$
$\int_0^{\infty}\left(\frac{3}{\left(x^2+1\right)}\right)dx$
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