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Arătati ca sin 60 +Cos 150=sin 30 +Cos 120

Răspuns :

Matepentrutoti
sin60=√3/2
cos150=cos(180-30)=cos180cos30+sin180sin30=-cos30=-√3/2
sin60+cos160=√3/2-√3/2=0
sin30=1/2
cos120=cos(180-60)=cos180cos60+sin180sin60=-cos60=-1/2
sin30+cos120=1/2-1/2=0

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