A graphing calculator or graphing software is required to plot these functions.
Graphing the functions manually requires creating a table as shown below.
For the sake of brevity, only a few points are shown in the table.
For the plot shown below, the spacing in t/π is 0.05 instead of 0.5.
t/π x(t) y(t)
------ ----------- -----------
0 0 1
0.5 0.0040 0.9626
1.0 0.0307 0.8567
1.5 0.0970 0.7006
2.0 0.2101 0.5199
2.5 0.3646 0.3426
3.0 0.5439 0.1928
3.5 0.7230 0.0858
4.0 0.8739 0.0252