$\cos2v-\sin4v$
$7\left(w+7\right)$
$\lim_{x\to5}\left(\frac{-5}{\left(x-5\right)^3}\right)$
$t^5\:4t^5\:7t^5$
$\left(7y+2z\right)^2$
$121n^2-x^4$
$\lim_{x\to\pi}\left(\frac{sen\:\left(54x\right)}{sen\left(18x\right)}\right)$
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