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Introduction to Sum and Difference Formulas in Trigonometry (Precalculus - Trigonometry 25)

Professor Leonard 45,107 4 years ago
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What the Sum and Difference formulas are for the three basic trig functions, where they come from, and how to use them to find exact solutions to angles that are not on the Unit Circle. Support: https://www.patreon.com/ProfessorLeonard

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