3.2.2 Double Angle Formulae
Double Angle Formulae
What are the double angle formulae?
- The double angle formulae are derived from the 'A+B' versions of the compound angle formulae:
Exam Tip
- The double angle formulae can be found in the formulae booklet – make sure you know where to find them.
- Look out for problems containing sinAcosA or an equation that contains both a double angle and a single angle.
Worked example
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