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Currently Playing: Using Sum and Difference Formulas in Trigonometry (Precalculus - Trigonometry 26)

How to use the Sum and Difference Formulas to find angles in Trigonometry including Inverse Trig functions, Unit Circle applications, and proofs of phase shift identities for Sine and Cosine. Support: https://www.patreon.com/ProfessorLeonard

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