Mathematics A-Level
Double angle formulae
What Double angle formulae means in Mathematics A-Level, as defined for Pearson Edexcel.
Definition of Double angle formulae
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Reference: Pearson Edexcel
Results such as sin 2A = 2 sin A cos A, obtained by setting B = A in the addition formulae.
Topics that use Double angle formulae
- Trigonometry (Pearson Edexcel A-Level)
Related terms
- Arcsin, arccos and arctan
- area of a triangle
- Asymptotes
- Domain
- Domains of reciprocal functions
- Equations involving multiples of the unknown angle
- Exact values
- Fundamental trigonometric identities
Using Double angle formulae in the exam
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