It is a sinusoidal graph, which oscilates around the x-axis (y=0), from y = -0.5 to y = 0.5
General description (as reference) It passes through the origin (0,0), increases until the max value (y = 0.5) when x = π6, then start to decrease, crosses the x-axis x = π/3, continues decreasing until the min value (y = -0.5) when x = 2π/3, then it starts to increase, crossing the x-axis again at x = 2π/3, and the pattern repeats indefinetely to the right of x = 2π/3 and to the left of x = 0.
Specific description:
Amplitud: 0.5----> the coefficient in front of the sine function
Period: 2π/3 ----> 2π divided by the coefficient in front of the argument (3)
Points of intersection with the x-axis: 0 + /- nπ/3, with n = 0,1,2,3,.....
