In PQR, PQ 3 cm, PR 6 cm, QR 5 cm and QPR 2 a Use the cosine rule to show that cos 2 5 9 b Hence find the exact value of sin ...

In PQR, PQ = 3 cm, PR = 6 cm, QR = 5 cm and QPR =

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In △PQR, PQ = 3 cm, PR = 6 cm, QR = 5 cm and ∠QPR = 2θ.

a. Use the cosine rule to show that cos 2θ = 5/9

b. Hence find the exact value of sin θ.

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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 07:11 AM

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In PQR, PQ = 3 cm, PR = 6 cm, QR = 5 cm and QPR =

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Pearson Edexcel A Level Mathematics Pure Mathematics Year 2

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