In algebra, we note that for any real numbers a, b, and c, the equation c(a – b) = ca – cb is an identity. Can we conclude that the equation cos(A – B) = cos A – cos B is an identity? Explain. Can sin θ, cos θ, and tan θ all be negative for any angle θ? Explain. Explain, in your own words, how reference angles are used to find the trigonometric functions of an obtuse angle.

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Fundamentals of Trigonometric Identities

Trigonometric Identities are the equalities that involve trigonometry functions and hold for all the values of variables given in the equation.