a By writing 3 as 2 , show that cos 3 4 cos 3 3 cos b Hence, or otherwise, for 0 , solve 6 cos 8 cos 3 1 0 giving your answer in terms of ...

a To show the trigonometric identity cos 3 4 cos3 3 cos using the angle addition formula well write ...

a. By writing 3 as 2 + , show that cos 3 4 cos 3

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a. By writing 3θ as 2θ + θ, show that cos 3θ ≡ 4 cos³ θ − 3 cos θ.

b. Hence, or otherwise, for 0 < θ < π, solve 6 cos θ − 8 cos³θ + 1 = 0 giving your answer in terms of π.

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Pearson Edexcel A Level Mathematics Pure Mathematics Year 2

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Authors: Greg Attwood, Jack Barraclough, Ian Bettison, David Goldberg, Alistair Macpherson, Joe Petran

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a. By writing 3 as 2 + , show that cos 3 4 cos 3

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Pearson Edexcel A Level Mathematics Pure Mathematics Year 2

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