This anonymous solver correctly identified the remaining curves, and explained how to draw a graph of sin x using the cosine function:
The red graph has equation y=-\sin x.
The green graph has equation y =\sin 2x.
The light blue graph has equation y=-\sin 2x.
The grey graph has equation y=\sin 3x.
The dark blue graph has equation y=-\sin 3x.
The graph y=\cos x is the same shape as y=\sin x but shifted along. I can make the shape of y=\sin x by drawing the graph y=\cos (x-90^{\circ}).