$\frac{64m^6-1}{2m-m}$
$\frac{5^a-1}{4}+5^a=\frac{5^{a+1}-1}{4}$
$\frac{3x^3-x^2-65x-2}{x-5}$
$\lim_{x\to0}\left(1-sen\left(2x\right)\right)^{\frac{4}{x}}$
$9xy+12-24xy-18$
$csc^2+tg^2-sec^2$
$\left(x-3y\right)\left(x-5y\right)-\left(x-4y\right)^2$
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