link to lesson and practice problems: [ Ссылка ]
link to geometric proof: [ Ссылка ]

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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