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Trigonometry Formulas Involving Triple Angle Identities.

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sin3A = 3sinA–4sin3A = 4sin(60∘−A).sinA.sin(60∘+A)

cos3A = 4cos3A–3cosA = 4cos(60∘−A).cosA.cos(60∘+A)

tan3A = 3tanA–tan3A / 1−3tan2A = tan(60∘−A).tanA.tan(60∘+A)

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