October 2018 2 68 Report

Sprawdź, czy równość (\frac{1}{2-2sin\alpha}+\frac{1}{2+2sin\alpha})\cdot ctg^{2}\alpha = \frac{1}{sin^{2}\alpha} , gdzie α∈(0°,90⁰), jest tożsamością trygonometryczną.


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