11.4 Values and Graphs

11.4 Values and Graphs

Using allied-angle identities, values at standard angles extend to $\pm 30^\circ$, $\pm 45^\circ$, …, $\pm 360^\circ$ and their supplements.

Graphing steps: build $(x,y)$ tables; plot angle on the $x$-axis and function value on the $y$-axis; join with a smooth curve. Trig graphs are continuous on their domains and repeat by periodicity.