Double Angle Formulae 0.0 / 5 ? MathematicsTrigonometry and radiansA2/A-levelAQA Created by: mattgwiffCreated on: 14-06-17 12:41 Double Angle Formulae sin2A = 2sinAcosA cos2A = cos²A - sin²A cos2A = 2cos²A - 1 cos 2A = 1 - 2sin²A tan2A = 2tanA 1 - tan²A 1 of 2 Compound Angle Formulae sin(A±B) = sinAcosB ± cosAsinB cos (A±B) = cosAcosB ∓ sinAsinB tan (A±B) = tanA ± tanB 1 ∓ tanAtanB 2 of 2
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