December 2018 1 13 Report
Uzasadnij tożsamości trygonometryczne.

a)  \frac{sin^{2} \alpha }{sin \alpha -1} + tg \alpha = -\frac{1}{cos \alpha }
b) tg^{2} \alpha - sin^{2} \alpha = tg^{2} \alpha *sin^{2} \alpha

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