Question 902810
{{{ graph( 400, 400, -10, 10, -10, 10, 5sin(x), 5sin(3x)) }}}
The red line is the graph of 5sin(x)
The green line is the graph of 5sin(3x)
With the sin(3X), you are actually dividing the period by 3.
An example of a phase shift would be sin(x-2) would shift the graph to the right 2 units.

Here is a link to purplemath that has a helpful description on graphing trigonometric functions.
http://www.purplemath.com/modules/grphtrig.htm