Card 1 of 20
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 cosθ=cosα\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.
Card 1 of 20
1.5.15 Trigonometric equations Flashcards
20 flashcards on OCR A Level Maths 1.5.15 Trigonometric equations: the key formulae, methods and definitions you need to recall for Paper 1, Paper 2 and Paper 3.