October 2018 1 25 Report

Oblicz cos( \alpha + \beta) i ctg2 /alpha wiedząc że cos /alpha = \frac{2}{3} i /alpha należy od ( \frac{3}{2} /pi do 2 \pi ) oraz ctg \beta = -2 \sqrt{2}, \beta należy od ( \frac{\pi}{2} do \pi )


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