DEPRECATED Symmetry and periodicity of trigonometric functions

Problem

The graph below contains the unit circle and angles with radian measures a, b, and c (marked by the curvy arrows).
Each angle has a corresponding ray whose intersection point with the unit circle is marked. All the angles marked with ticks have measure a.
Select the correct category based on the picture.
 
sine, left parenthesis, a, right parenthesis
cosine, left parenthesis, a, right parenthesis
minus, sine, left parenthesis, a, right parenthesis
minus, cosine, left parenthesis, a, right parenthesis
sine, left parenthesis, b, right parenthesis
cosine, left parenthesis, b, right parenthesis
sine, left parenthesis, c, right parenthesis
cosine, left parenthesis, c, right parenthesis
Do 7 problems