1/ sin2x-1=0
cos(x-pi/4)=0 x-pi/4=pi(2k+1)/2 x=pi(8k+3)/4
sin2x=1 2x=pi/2+2pik x=pi/4+pik
2. cos2x=-1 2x=pi+2pik [x=pi/3+pik
tgx/2=1 x=pi/2+2pik
1/ sin2x-1=0
cos(x-pi/4)=0 x-pi/4=pi(2k+1)/2 x=pi(8k+3)/4
sin2x=1 2x=pi/2+2pik x=pi/4+pik
2. cos2x=-1 2x=pi+2pik [x=pi/3+pik
tgx/2=1 x=pi/2+2pik