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(sinα²+2sinα*1+1²) + (cosα²-2cosα*1+1²) - 3
sin²α+cos²α+2(sinα-cosα)+2-3=1+2(sinα-cosα)-1=2(sinα-cosα)
Wykorzystano jedynkę trygonometryczną czyli
sin²α+cos²α=1