Lecture 21 (Discrete Math) Trigonometry Identities

The Pythagorean identity proved from the unit circle states that:

1. A.sin(theta) + cos(theta) equals one
2. B.sin^2(theta) + cos^2(theta) equals one
3. C.sin^2(theta) - cos^2(theta) equals one
4. D.tan^2(theta) + 1 equals cos(theta)