$\frac{m^4-25m+m^2}{m-3}$
$\left(k-8m\right)^2$
$\lim_{x\to a}\left(\frac{cos\left(x\right)-\cos\left(a\right)}{x-a}\right)$
$\frac{4a}{2b}$
$76-43-54+87+91$
$\frac{sen^2\:x\:-tg^2\:x}{cos^2\:x\:-cotg^2\:x}$
$y=\frac{lne^{3x}}{3}+c$
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