PreCalculus - Trigonometry: Trig Identities (18 of 57) Proof Using Addition & Subtraction Formulas

Описание к видео PreCalculus - Trigonometry: Trig Identities (18 of 57) Proof Using Addition & Subtraction Formulas

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In this video I will prove the trigonometric cofunction tan[(pi/2)-B]=cotB.

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