$39=20-19sin\left(120t\right)$
$\sqrt{2}\sqrt{14}$
$\left(\frac{1}{cos\:\theta\:}-tan\:\theta\:\right)^2\:$
$\left[2x-7\right]=x-3$
$\left(m^2\right)\left(m^4\right)$
$\left(2+\frac{a}{3}\right)\left(-\frac{a}{2}+2\right)$
$\lim_{x\to2}\left(x-2\right)\left(\frac{3}{2}x-3\right)^3$
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