Question 912780
Use the unit circle 

<img width = 45% src = "http://upload.wikimedia.org/wikipedia/commons/thumb/4/4c/Unit_circle_angles_color.svg/2000px-Unit_circle_angles_color.svg.png">

to get {{{sin(x)=0}}} to have these three solutions: {{{x = 0}}}, {{{x = pi}}} or {{{x = 2pi}}}