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1. In triangle ABC, AB = y, BC = r, AC = 8, and the perimeter is 20. a) Write y in terms of x. b) Use the cosine rule to write y2 in terms of a and cos C. 3.r r – 10 c) Hence show that cos C = Show all working. 2x

1. In triangle ABC, AB = y, BC = r, AC = 8, and the perimeter is 20. a) Write y in terms of x. b) Use the cosine rule to write y2 in terms of a and cos C. 3.r r – 10 c) Hence show that cos C = Show all working. 2x

Advanced Engineering Mathematics
Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
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1. In triangle ABC, AB = y, BC = x, AC = 8, and the perimeter is 20. a) Write y in terms of r. b) Use the cosine rule to write y² in terms of x and cos C. COS 3x – 10 c) Hence show that cos C Show all working. %3D 2x
Transcribed Image Text:1. In triangle ABC, AB = y, BC = x, AC = 8, and the perimeter is 20. a) Write y in terms of r. b) Use the cosine rule to write y² in terms of x and cos C. COS 3x – 10 c) Hence show that cos C Show all working. %3D 2x
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