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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Related Book For
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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