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1.5.15 Trigonometric equations

Which calculator mode is required when the interval contains degree symbols?

A

Use degree mode.

B

Sine and cosine have period 360∘360^\circ360∘ or 2π2\pi2π radians.

C

θ=90∘, 210∘, 330∘\theta=90^\circ,\ 210^\circ,\ 330^\circθ=90∘, 210∘, 330∘.

D

If cos⁡θ=cos⁡α\cos\theta=\cos\alphacosθ=cosα, then in radians the complete family is θ=2πn±α\boxed{\theta=2\pi n\pm\alpha}θ=2πn±α​, where n∈Zn\in\mathbb{Z}n∈Z.

1.5.15 Trigonometric equations Flashcards

  1. A Level
  2. /Maths
  3. /1.5.15 Trigonometric equations

Flashcards for OCR A Level Maths 1.5.15 Trigonometric equations, covering the key formulae, methods and definitions you need to recall for Paper 1, Paper 2 and Paper 3. 20 cards, matched to the OCR A Level Maths (H240) 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.