PreCalculus - Trigonometry: Trig Identities (20 of 57) Proof Using Addition & Subtraction Formulas

Описание к видео PreCalculus - Trigonometry: Trig Identities (20 of 57) Proof Using Addition & Subtraction Formulas

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In this video I will prove the trigonometric identity tanA-tanB=sin(A-B)/(cosAcosB).

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