PreCalculus - Trigonometry: Trig Identities (36 of 57) Product to Sum Formula 2

Описание к видео PreCalculus - Trigonometry: Trig Identities (36 of 57) Product to Sum Formula 2

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In this video I will prove cosAcosB=(1/2)[cos(A+B)+cos(A-B)] and sinAsinB=1/2)[cos(A+B)-cos(A-B)].

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