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Proof of Sum and Difference Formulas for Sine, Cosine, and Tangent
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Here I prove the sum and difference formulas for Sine, Cosine, and Tangent Trigonometric Functions.
The main proof I discuss is one based on geometry. There are other proofs that may be shorter, but this is definitely the most intuitive proof that I know of at this level.
The main proof I discuss is one based on geometry. There are other proofs that may be shorter, but this is definitely the most intuitive proof that I know of at this level.
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