Given that cos x = 1/4, find the exact value of cos 2x.

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Pearson Edexcel A Level Mathematics Pure Mathematics Year 2

ISBN: 9781292183404

1st Edition

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

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Question Posted: Aug 11, 2023 07:12 AM

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Given that cos x = 1/4, find the exact value of cos 2x.

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We can use the double angle formula for cosine to find the ...View the full answer

Pearson Edexcel A Level Mathematics Pure Mathematics Year 2

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