Edexcel A Level Maths: Pure:复习笔记5.6.2 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 are not included in the formulae booklet – you have to know them.
- If you forget them, you can always derive them from the compound angle formulae (which are in the formula booklet) as shown above.
Worked Example
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