1) sin^2x=1/2
sinx=+-sqrt(2)/2
x=+-П/4+2Пk
x=+-5П/4+2Пk
2)1-cos3x=2sin(3/2x)
sin(3/2x)=t
2t^2-2t=0
t^2-t=0
t=0 sin(3/2x)=0 3/2x=Пk x=2/3Пk
t=1 sin(3/2x)=1 3/2x=П/2+2Пk x=П/3+4П/3k
1) sin^2x=1/2
sinx=+-sqrt(2)/2
x=+-П/4+2Пk
x=+-5П/4+2Пk
2)1-cos3x=2sin(3/2x)
sin(3/2x)=t
2t^2-2t=0
t^2-t=0
t=0 sin(3/2x)=0 3/2x=Пk x=2/3Пk
t=1 sin(3/2x)=1 3/2x=П/2+2Пk x=П/3+4П/3k