The first step is to enter the function in the function editor. We will use the function name Y1. The Y1 symbol represents the variable y. Enter the rule for the function to the right of the equal sign. Use the  key to enter the variable x. Clear any previous functions from the editor if necessary.
To decide on an optimal window for the graph, we need the period, amplitude, vertical shift
and phase shift (horizontal shift). You should be able to determine (from the function) that the
period is π/2, the amplitude is 3, the vertical shift is 2 units upward, and the phase
shift is π/4 to the right. From what we know about the period, the function will complete
one cycle when |
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(Clear any previous functions)
3 
4 
. Solving for x,
this means 
.
