February 2019 0 42 Report
Sprawdź tożsamości trygonometryczne
 \frac{cos \frac{ \alpha }{2} -sin \frac{ \alpha }{2} }{cos \frac{ \alpha }{2} +sin \frac{ \alpha }{2} } = \frac{1}{cos \alpha } - tg \alpha

tg(30+ \frac{ \alpha }{2} ) tg(30- \frac{ \alpha }{2})= \frac{2cos \alpha -1}{2cos \alpha +1}

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