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Proofs of Trigonometric Identities
Convert to sine/cosine, use basic identities, and simplify sides of the equation.
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Verifying Trigonometric Identities - Example 4
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Verify a Trigonometric Identity Algebraically by Working with Both Sides
MAT.TRG.303.03 (Proofs of Trigonometric Identities - Trigonometry)
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