Topics · 3 identities

Pythagorean

The three Pythagorean identities relating sine, cosine, tangent, and their reciprocals.

Pythagorean identity

\sin^{2}\theta + \cos^{2}\theta = 1

1 + \tan^{2}\theta = \sec^{2}\theta

1 + \cot^{2}\theta = \csc^{2}\theta