Question 454002
solve cos(x/2)=(&#8730;2/2) if 0<=x<360
..
cos(x/2)=sqrt((1+cos x)/2)=&#8730;2/2
square both sides
((1+cos x)/2)=2/4=2/4=1/2
1+ cos x=1
cos x=0
x=&#960;/2,3&#960;/2