Question

solve for all theta radians. sin(3 theta)=0

Answer 1

when is sine 0?

Answer 2

sin is 0 at 0, pi, and 2pi.

Answer 3

The answers would be:
sin (3theta) = 0, pi, 2pi, 3pi, 4pi,.... everywhere sin = o
sin (theta) = 0, pi/3, 2pi/3, pi, 4pi/3,... divide all above answers above through by 3