Question 683333
find all values of &#945;; 0°<&#945;<360° that satisfy 
2cos(2x)=1
2(1-2sin^2x)=1
1-2sin^2x=1/2
2sin^2x=1-1/2=1/2
sin^2x=1/4
sinx=1/2
x=30º and 150º