February 2019 0 13 Report
Sprawdź tożsamość trygonometryczną:
a) ( tg  \alpha + ctg  \alpha )^2= \frac{1}{sin ^{2} \alpha * cos ^{2} \alpha }
b) tg \alpha - ctg  \alpha = ( tg  \alpha -1) (ctg \alpha +1)
c) ctg \alpha +  \frac{sin \alpha }{1+cos \alpha } =  \frac{1}{sin \alpha }

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