Use the figure to prove the subtraction formula cos(a - B) = cos a cos B +
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Use the figure to prove the subtraction formula cos(a - B) = cos a cos B + sin a sin B
Compute c2 in two ways (using the Law of Cosines from Exercise 83 and also using the distance formula) and compare the two expressions.]
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In AOB AOB Apply the Law of cosine in AOB cos 1 2 1 2 c 2 21 1 2 c 2 2 ...View the full answer
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