CIE A Level Maths: Pure 3复习笔记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:

Double Angle Forms Illustr 1_sin, A Level & AS Maths: Pure revision notes Double Angle Forms Illustr 2_cos, A Level & AS Maths: Pure revision notes Double Angle Forms Illustr 3_tan, A Level & AS Maths: Pure revision notes

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

Double Angle Forms Example, A Level & AS Maths: Pure revision notes

 

 

 

 

 

 

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