Pure maths ch9 - Study guides, Class notes & Summaries
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PURE MATHS CH9 VERIFIED 100% SOLUTIONS
- Exam (elaborations) • 16 pages • 2023
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PURE MATHS CH9

VERIFIED 100%

SOLUTIONS

cosine rule (2)

a² = b²+c²-2bcCosA

CosA = (b²+c²-a²)/2bc

Use trigonometric ratios for right angled triangles to

prove the cosine rule

the largest angle is always opposite the ... (2)

largest side

(and vice versa)
Exam (elaborations)
PURE MATHS CH9 VERIFIED 100% SOLUTIONS
Last document update:
ago
PURE MATHS CH9 
VERIFIED 100% 
SOLUTIONS 
cosine rule (2) 
a² = b²+c²-2bcCosA 
CosA = (b²+c²-a²)/2bc 
Use trigonometric ratios for right angled triangles to 
prove the cosine rule 
the largest angle is always opposite the ... (2) 
largest side 
(and vice versa)
$9.49
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