sin 390 + cos 540 = ????
Pomocy!
sin360=0
cos360=1
sin30=0,5
cos180=-1
sin390+cos540=sin(360+30)+cos(360+180)=sin360cos30+cos360sin30+cos360cos180-sin360sin180=sin30+cos180=0,5+(-1)=-0,5
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sin360=0
cos360=1
sin30=0,5
cos180=-1
sin390+cos540=sin(360+30)+cos(360+180)=sin360cos30+cos360sin30+cos360cos180-sin360sin180=sin30+cos180=0,5+(-1)=-0,5