Trig Sum And Difference Identities Practice. How to use the sum identities and difference identities to simplify trigonometric expressions. Sum and Difference Trigonometric Formulas.
Practice with Sum and Difference Identities KEY Write each expression as the sine cosine or tangent of a single angle. If youve got sum time see what a difference these formulas will make for your trig toolkit. Difference identities condense each of the following and express as a trig function of a single angle.
Cos72 cos130 sin72 sin130o o o o 3.
The sum identities and difference identities for sine cosine and tangent. Sin97 cos43 cos97 sin43o o o o 2. In school we just started learning about trigonometry and I was wondering. How to use the sum identities and difference identities to simplify trigonometric expressions.
