$\frac{8}{7.21}$
$\frac{1-v^{12}}{1-v^6}$
$\frac{25-36x^4}{5+6x^2}$
$\frac{x^{3m}-x^{-m}}{x^3-x^{-1}}$
$\int\left(\left(cos\left(8x\right)\right)^4\right)dx$
$x^4-4x$
$x\left(2-y\right)+4\left(y-2\right)$
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