Graphs of sine, cosine, tangent
Left panel shows sine, cosine and tangent as horizontal coordinate (HC) and vertical coordinate (VC) of the point on the unit circle where the ray from the origin intersects the circle.
Right panel shows the angle, x, and guide markers for y=sin(x), y=cos(x) and y=tan(x) tracked as x changes. Turn on 'Graphs' to trace the path of those markers.