How to draw the graph of y = sin(2x + pi/4) using the five points method

This lesson shows how to draw the graph of y = sin (2x + pi/4) using the five points methods. Let 2x + pi/4 = 0, to find the value of x which make y = 0 [because sin (0) = 0].
Let 2x + pi/4 = pi/2, to find the value of x which make y = 1 [because sin(pi/2) = 1]. Let 2x + pi/4 = pi, to find the value of x which make y = 0 [because sin(pi) = 0].
Let 2x + pi/4 = 3pi/2, to find the value of x which make y = -1 [because sin(3pi/2) = -1]. Let 2x + pi/4 = 2pi, to find the value of x which make y = 0 [because sin(2pi) = 0].