November 2018 1 6 Report
Proszę o pomoc ! Ładnie , przejrzyście rozpisane .
Dowodzenie tożsamości trygonometrycznej
 (cos \alpha + sin \alpha ) ^{2} - 2 sin \alpha cos \alpha = 1
(sin \alpha - cos \alpha ) ^{2} = 1 - 2sin \alpha cos \alpha



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