Graphs of trigonometric functions can be produced in degrees or in radians.
The graphs appearing here will be done in radians.
Hint: When handdrawing the graphs of sine and cosine, draw vertical dotted lines at intervals to remind you of the connection to the quadrants from the unit circle and to keep your graphs accurate. (Such dotted lines will resemble the dashed vertical grid lines in the graphs below.) 
The sine and cosine functions take on yvalues between 1 and 1.
appearance (also referred to as oscillating) amplitude: 1 (height) period: (length of one cycle) frequency: 1 cycle in radians [or 1/()] domain: range:


appearance amplitude: 1 period: frequency: 1 cycle in radians [or 1/()] domain: range:


Did you notice that the cosine curve is really the exact same graph as the sine curve shifted 90º (or radians) to the left! 
