MATSEC AM Pure Mathematics Complete Prep Course — Lesson 49: Compound angle identities

Sarah builds the three compound angle formulas for sine, cosine and tangent, stressing that cosine and tangent flip the sign on the right-hand side. She splits fifteen degrees into forty-five minus thirty to get cosine fifteen as root six plus root two over four, works tangent seventy-five and an obtuse-angle sine problem, and explains why tangents multiplying to one mean a right angle.

Lesson 49 of 158 in the MATSEC AM Pure Mathematics Complete Prep Course audio course from ExamPrepRise.

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