Skip to content

Course home

3.4.5 Trigonometry (A-level only)

Card 1 of 20

State the sine double-angle formula.

A

Double-angle formulae are obtained by substituting A=B=θ\boxed{A=B=\theta}A=B=θ​ into the addition formulae.

B

Using cos⁡2θ=2cos⁡2θ−1\cos 2\theta=2\cos^2\theta-1cos2θ=2cos2θ−1 gives 1+cos⁡2θ=2cos⁡2θ1+\cos 2\theta=2\cos^2\theta1+cos2θ=2cos2θ.

C

sin⁡2θ=2sin⁡θcos⁡θ\sin 2\theta=2\sin\theta\cos\thetasin2θ=2sinθcosθ

D

cos⁡2θ−sin⁡2θ\cos^2\theta-\sin^2\thetacos2θ−sin2θ

Card 1 of 20

3.4.5 Trigonometry (A-level only) Flashcards

  1. A Level
  2. /Maths
  3. /3.4.5 Trigonometry (A-level only)

20 flashcards on CCEA A Level Maths 3.4.5 Trigonometry (A-level only): the key formulae, methods and definitions you need to recall for AS 1, AS 2, A2 1 and A2 2.

Flashcards