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1.5.4 Trigonometry

Card 1 of 20

On the unit circle, the point reached after turning through angle xxx has coordinates [...]\text{[...]}[...].

A

Use sin⁡2x=1−cos⁡2x\sin^2x=1-\cos^2xsin2x=1−cos2x.

B

On the unit circle, the point reached after turning through angle xxx has coordinates (cos⁡x,sin⁡x)\boxed{(\cos x,\sin x)}(cosx,sinx)​.

C

The legs are cos⁡x\cos xcosx and sin⁡x\sin xsinx, so cos⁡2x+sin⁡2x=12\cos^2x+\sin^2x=1^2cos2x+sin2x=12.

D

Use cos⁡2x=1−sin⁡2x\cos^2x=1-\sin^2xcos2x=1−sin2x.

Card 1 of 20

1.5.4 Trigonometry Flashcards

  1. A Level
  2. /Maths
  3. /1.5.4 Trigonometry

20 flashcards on WJEC A Level Maths 1.5.4 Trigonometry: the key formulae, methods and definitions you need to recall for AS Unit 1, AS Unit 2, A2 Unit 3 and A2 Unit 4.

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