One period is from x= 0 to so "two periods" is from x= 0 to .
Without using a calculator, graph y = 2 sin (3t + pi/2) over two full periods. Be sure to label the units on your axes.
So the period of this function is 2pi/3. When they asked over two full periods, do we just multiply 2pi/3 by 2 or is there something else to it?