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1.8.6 Compound and double angle formulae (A-level only)

Card 1 of 21

How does sin⁡(A+B)\sin(A+B)sin(A+B) expand?

A

sin⁡(A+B)=sin⁡Acos⁡B+cos⁡Asin⁡B\sin(A+B)=\sin A\cos B+\cos A\sin Bsin(A+B)=sinAcosB+cosAsinB

B

The cosine-only double-angle form is cos⁡2A=2cos⁡2A−1\boxed{\cos2A=2\cos^2A-1}cos2A=2cos2A−1​.

C

r=a2+b2r=\sqrt{a^2+b^2}r=a2+b2​

D

cos⁡2A=cos⁡2A−sin⁡2A\cos2A=\cos^2A-\sin^2Acos2A=cos2A−sin2A

Card 1 of 21

1.8.6 Compound and double angle formulae (A-level only) Flashcards

  1. A Level
  2. /Maths
  3. /1.8.6 Compound and double angle formulae (A-level only)

21 flashcards on AQA A Level Maths 1.8.6 Compound and double angle formulae (A-level only): the key formulae, methods and definitions you need to recall for Paper 1, Paper 2 and Paper 3.

Flashcards