$49m^2-81n^2$
$\lim_{x\to0}\:\frac{1-\cos\left(3x\right)}{6x}$
$\int4x^{5}e^{-x^{6}}dx$
$\left(b-m\right)\left(4-n\right)+4a^2$
$\frac{8m^2}{10m^3}$
$sin\:\left(a\right)+sin\:\left(2a\right)+\:sin\:\left(3a\right)=sin\:\left(2a\right)\left(1+2cos\:\left(a\right)\right)$
$-\frac{3}{5}m+\frac{1}{4}m-\frac{1}{2m}$
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