The graph below shows y = sin , 0 360, with onevalue of ( = ) marked on the axis. a.

The graph below shows y = sin θ, 0 ≤ θ ≤ 360°, with one value of θ (θ = α) marked on the axis.

a. Copy the graph and mark on the θ-axis the positions of 180° − α, 180° + α, and 360° − α.

b. Verify that: sin α = sin (180° − α) = −sin (180° + α) = −sin (360° − α).

VA 1 -1- a 90 180 270 360