Use the figure to prove the subtraction formula cos(a B) cos a cos B sin a sin B Compute c 2 in two ways (using the Law of Cosines from Exercise 83 and also using the distance formula) and compare the two expressions

Question: Use the figure to prove the subtraction formula cos(a - B) = cos a cos B + sin a sin B Compute c 2 in

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.] Use the figure to prove the subtraction formula cos(a - B) =

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