$\frac{-1}{ctg}-1tg$
$\left(6b-5\right)\left(b+1\right)$
$\lim_{x\to0}\left(\frac{3x^2+5x-2}{x+2}\right)$
$\left(7f-3\right)\left(f^2-2f+7\right)$
$tan765$
$\int\left(2^{\theta}sin\left(\theta\right)\right)dx$
$\int\left(\frac{2x^2-5x+3}{9x-2}\right)dx$
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