Sketch, on separate sets of axes, the graphs of the following, in the interval 0 ≤ θ ≤ 360°. Give the coordinates of points of intersection with the axes, and of maximum and minimum points where appropriate.

a. y = −cos θ 

b. y = 1/3 sin θ 

c. y = sin 1/3 θ 

d. y = tan (θ − 45°)