Kąt alfa jest ostry oraz sin alfa +cos alfa =1 . Iloczyn sin alfa razy cos alfa jest rowny :
sin x +cos x=1 |()^2
(sinx +cosx)^2=1
sin^2x +2sinxcosx+cos^2x=1
sin^2x+cos^2x+2sinxcosx=1
1+2sinxcosx=1
2sinxcosx=0
sinxcosx=0
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sin x +cos x=1 |()^2
(sinx +cosx)^2=1
sin^2x +2sinxcosx+cos^2x=1
sin^2x+cos^2x+2sinxcosx=1
1+2sinxcosx=1
2sinxcosx=0
sinxcosx=0