LAC 28:CXLII.2919. Trigonometric Functions

A. Prove and apply trigonometric identities. 1. Prove the Pythagorean identity sin2(θ) + cos2(θ) = 1 and use it to find the value of sin(θ), cos(θ), or tan(θ) given sin(θ), cos(θ), or tan(θ) and the quadrant of the angle.