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1.4.5 Trigonometry

Which side ratio gives sin⁡x\sin xsinx in a right-angled triangle?

A

The tangent identity is tan⁡x≡sin⁡xcos⁡x\boxed{\tan x\equiv\dfrac{\sin x}{\cos x}}tanx≡cosxsinx​​, where cos⁡x≠0\cos x\neq0cosx=0.

B

Every side gains the same scale factor, which cancels in each ratio.

C

Taking a square root when finding cosine gives cos⁡x=±1−sin⁡2x\boxed{\cos x=\pm\sqrt{1-\sin^2x}}cosx=±1−sin2x​​; the quadrant determines the sign.

D

oppositehypotenuse\dfrac{\text{opposite}}{\text{hypotenuse}}hypotenuseopposite​

1.4.5 Trigonometry Flashcards

  1. A Level
  2. /Maths
  3. /1.4.5 Trigonometry

Flashcards for CCEA A Level Maths 1.4.5 Trigonometry, covering the key formulae, methods and definitions you need to recall for AS 1, AS 2, A2 1 and A2 2. 20 cards, matched to the CCEA A Level Maths (2210) specification. Recall questions account for roughly 50% of marks at A Level Maths, so these target the marks you can secure before the paper starts.