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Ex 3 dau coroana!!!!!!

Ex 3 Dau Coroana class=

Răspuns :

cos30=rad3/2
cos60=1/2
cos120=cos(180-60)=-cos60=-1/2
cod150=cos(180-30)=-cos30=-rad3/2
cos30+cos60+cos120+cos150=rad3/2 +1/2 -1/2-rad3/2=0