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Currently Playing: Proving the Double and Half Angle Formulas for Trigonometry (Precalculus - Trigonometry 27)

The proofs of Double Angle Formulas and Half Angle Formulas for Sine, Cosine, and Tangent. These proofs help understand where these formulas come from, and will also help in developing future identities. Support: https://www.patreon.com/ProfessorLeonard

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