$\left(-8x-4y\right)^3$
$+10-8+4-7-1+6$
$\lim_{x\to0}\left(\frac{\left(x+3\right)^{-1}-3}{x}\right)$
$\frac{\cot\left(x\right)}{\tan\left(x\right)}-\frac{\csc\left(x\right)}{\sin\left(x\right)}$
$\left(a+4\right)\left(b-3\right)$
$\left(7w+3u\right)\left(7w-3u\right)$
$sen^3a\:cosa\:+\cos^3a\:sena$
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