Remember when graphing the curves of trig functions sine and cosine, need to know the graph of the basic functions. Then look for amplitude, phase shift, vertical shift and spacing.
Sinx has period 2Pi, as does Cosx
aSin(bx + c) + d
a is the amplitude
2Pi/b is the period
c is the phase shift
d is the vertical shift
To get the spacing, divide the period by 4
Remember the parent functions sine and cosine have max of 1 and min of -1.