$\frac{64\cdot\:6^{-2}}{6^{-1}\cdot\:4}$
$2xy-2xy+2xy$
$\frac{sin^2x-tan^2x}{tan^2xsin^2x}$
$\left(x+123x^2\right)^2$
$abc+abc^3$
$\lim_{x\to0}\left(\frac{4x^2}{cos\:x-1}\right)$
$8b+4-4b+2$
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