Răspunsuri

2014-09-12T18:49:13+03:00
Sin 120=sin (90+30)=sin 90.cos30+sin30.cos90=1.√3/2+1/2.0=√3/2
3 3 3
2014-09-12T18:49:38+03:00
Sin120=sin(180-60)
sin180*cos60-sin60*cos180=radical 3/2