The Amazing Unit Circle
Trigonometric Function Facts 
The unit circle x^{2} + y^{2} = 1 is a mine of information about the trigonometric functions. 
Roll over a link to see what the unit circle tells you about that aspect of the trigonometric functions. Click to get more details about that topic. 
All six trig. functions as lengths The fundamental trigonometric identity Signs of sine, cosine and tangent, by quadrant Reference angles, Quadrant III Periods of sine, cosine and tangent Complementary angle identities 
Now available: Amazing Unit Circle tshirt shows identities (shirt front) and all six trigonometric functions as lengths (shirt back). It's a great gift for students and teachers. 

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