AQA 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:

5.6.2-Double-Angle-Forms-Illustr-1_sin 5.6.2-Double-Angle-Forms-Illustr-2_cos 5.6.2-Double-Angle-Forms-Illustr-3_tan

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

5.6.2-Double-Angle-Forms-Example

 

 

 

 

 

 

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