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Cosine compound-angle identities:
cos⁡(x−α)=\cos(x-\alpha)=cos(x−α)= [...]\text{[...]}[...]
cos⁡(x+α)=\cos(x+\alpha)=cos(x+α)= cos⁡xcos⁡α−sin⁡xsin⁡α\cos x\cos\alpha-\sin x\sin\alphacosxcosα−sinxsinα

A

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B

Cosine compound-angle identities:
cos⁡(x−α)=\cos(x-\alpha)=cos(x−α)= cos⁡xcos⁡α+sin⁡xsin⁡α\cos x\cos\alpha+\sin x\sin\alphacosxcosα+sinxsinα
cos⁡(x+α)=\cos(x+\alpha)=cos(x+α)= cos⁡xcos⁡α−sin⁡xsin⁡α\boxed{\cos x\cos\alpha-\sin x\sin\alpha}cosxcosα−sinxsinα​

C

Cosine compound-angle identities:
cos⁡(x−α)=\cos(x-\alpha)=cos(x−α)= cos⁡xcos⁡α+sin⁡xsin⁡α\boxed{\cos x\cos\alpha+\sin x\sin\alpha}cosxcosα+sinxsinα​
cos⁡(x+α)=\cos(x+\alpha)=cos(x+α)= cos⁡xcos⁡α−sin⁡xsin⁡α\cos x\cos\alpha-\sin x\sin\alphacosxcosα−sinxsinα

D
  • rsin⁡β=Ar\sin\beta=Arsinβ=A
  • rcos⁡β=Br\cos\beta=Brcosβ=B

Card 1 of 24

3.5.7 Trigonometry (A-level only) Flashcards

  1. A Level
  2. /Maths
  3. /3.5.7 Trigonometry (A-level only)

24 flashcards on WJEC A Level Maths 3.5.7 Trigonometry (A-level only): the key formulae, methods and definitions you need to recall for AS Unit 1, AS Unit 2, A2 Unit 3 and A2 Unit 4.

Flashcards