This task is designed to encourage learners to attend to the y coordinates of the points on the trigonometric graphs.  Common errors have, in experience, included ordering simply by the magnitude of the angle.  Suggesting that learners draw a sketch of each graph in order to appreciate the concept may help. 

Extension could be to make use of the periodicity of the graph and add (or subtract) mutliples of 360 from the values in the questions above. 

Credit: @chrismcgrane84