1.
sin5x = sin6x
sin5x-sin6x=0
-2cos(11x/2)•sin(x/2)=0
1) cos(11x/2)=0 => 11x/2=π/2+πn => x= π/11+(2π/11)•n, n∊Z
2) sin(x/2)=0 => x/2=πn => x=2πn, n∊Z.
2.
sin3x-sinx=2
sinxcos2xcos2x(2sinx-sqrt(3))=0
cos2x=0
2x=П/2*(2n+1)
x=П*((2n+1)/4)
sinx=sqrt(3)/2
x=П/3+2Пn, n∊Z.
x=2/3П+2Пn, n∊Z.