\(y = \sin (x - a)^\circ\) where \(a\) is called the phase angle. This is when the graph of the function has been shifted to the left or right by \(a\) degrees. If you have: \(\sin {(x - a)^ \circ ...

The angles are labelled with capital letters. The opposite sides are labelled with lower case letters. Notice that an angle and its opposite side are the same letter. The sine rule is: \(\frac{a} ...