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sin²α-2sinαcosα+cos²α=25/16
1-2sinαcosα=25/16
2sinαcosα=25/16-1
2sinαcosα=-9/16
wzór skróconego mnożenia i jedynka trygonometryczna- sin²α+cos²α=1 (sinα+cosα)²=sin²α+2sinαcosα+cos²=1-2sinαcosα=1-9/16=7/16