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Double-angle Formulas (d) sin 20 = 2 sin 0 cos 0 (e) cos 20 = cos2 0 - sin2 0 = 1 - 2 sin2

Double-angle Formulas (d) sin 20 = 2 sin 0 cos 0 (e) cos 20 = cos2 0 - sin2 0 = 1 - 2 sin2 0 = 2 cos20 - 1 (f) tan 20 2 tan2 0 = 1-tan2 0 (g) Derive the the formula of cos 40

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