Angles used to illustrate the sum and difference of two angles and trig identities.

Illustration of the projection of point P as it moves around a vertical circle of radius 3 in. in a…

Illustration of the projection of point P as it moves around a vertical circle of radius 2 ft. in a…

Secant and Cosecant curves plotted from negative pi to 2 pi. Graph of y=sec x and y=csc x.

Sine curves of varying frequency and amplitude plotted from 0 to 2 pi. Graph of y= sin θ, y= 1/2…

Sine curves of varying frequency plotted from 0 to 2 pi. Graph of y= sin t, y= r sin1/2t, y=r sin 2t.

Tangent and Cotangent curves plotted from negative pi to 2 pi. Graph of y=tan x and y=cot x.

Right triangle OCB that can be used to show the relationships between x, y, r, and Θ.