2+2sin^2 x = 3
sin^2 x = 1/2
sin x = 1/sqrt(2) or sin x = -1/sqrt(2)
x=pi/4+pi*n/2, n in Integers
3sin^2 x=1-sin^2 x
sin^2 x = 1/4
sin x = 1/2 or sin x = -1/2
x=+-pi/6 + pi*k, k in Integers
sinx(sinx+1)=0
sin x = 0 or sin x = -1
x=pi*n, x=-pi/2+2*pi*k, k, n in Integers
arccos(-1/2)=pi-pi/3=2pi/3
cos(arcsin sqrt(2)/2)=sqrt(2)/2