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Trigonometry Formulas Involving Triple Angle Identities.

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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