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Using the scalar product to prove the cosine rule
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Dr. Jennifer Chang Wathall
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Using the scalar product to prove the cosine rule
1.
Using the Scalar Product to Prove the Cosine Rule Part A Before we start this proof you need to use the following properties of the scalar product: 1. 𝒄 ∙
𝒄 = 2. 𝒃 ∙ 𝒄 = 3. 𝒃 − 𝒄 ∙ (𝒃 − 𝒄) = Part B Label the following triangle ABC where: 𝐴𝐵 represents the vector 𝒄 𝐴𝐶 represents the vector 𝒃 What is 𝐵𝐶 in terms of 𝒄 and 𝒃? Label this on the diagram What is 𝐵𝐶 ∙ 𝐵𝐶 ? Using 1,2 and 3 from part A put this altogether to find the length of (𝐵𝐶)!
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