4cos840=4cos(14*60)=-4*1/2=-2
√48sin600=√48sin(60*10)=-√48* √3/2=-12/2=-6
ctg^2(30)=3
-2+6+3=7
4cos840=4cos(720+90+30)=-4sin30=-4*1/2=-2
√48sin600= √48sin(360+180+60)= -√48sin60=- √48 √3/2=-12/2=-6
ctg^2(30)=( √3)^2=3
4cos840=4cos(14*60)=-4*1/2=-2
√48sin600=√48sin(60*10)=-√48* √3/2=-12/2=-6
ctg^2(30)=3
-2+6+3=7
4cos840=4cos(720+90+30)=-4sin30=-4*1/2=-2
√48sin600= √48sin(360+180+60)= -√48sin60=- √48 √3/2=-12/2=-6
ctg^2(30)=( √3)^2=3
-2+6+3=7