December 2018 1 9 Report
Wykaż, że równość jest tożsamością.

a) (cos \alpha -sin \alpha )(1+sin2 \alpha )=cos2 \alpha (sin \alpha +cos \alpha )
b) 1+sin4 \alpha =(1+2sin \alpha cos \alpha -2sin^{2} \alpha )^{2}
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