4.4 Compound Angle Identities (full lesson) | MHF4U
link to lesson and practice problems: https://www.jensenmath.ca/12af-l2-com...
link to geometric proof: • PROOF of Compound Angle Identities | jense...
In this lesson you will learn the proof of the compound angle identities sin(x+y), cos(x+y), sin(x-y), and cos(x-y). You will then learn some applications of those identities.including finding exact values of trig ratios that have angles that can be expressed as a sum or difference of special angles.
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