$-2\:.\:\left(-13\right)$
$4b+\left(-8\right)b$
$\int3xsin\left(6x+3\right)dx$
$n^2-18n+10$
$2cos^2\left(\frac{x}{2}\right)tan\left(\frac{x}{2}\right)$
$\lim\:_{x\to\:-2}\left(\frac{sen\left(5x+10\right)}{cos\left(4x+8\right)}\right)$
$3\left(5-3w\right)$
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