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  3. you are given that cos(a) =-5/13 with a in quadran

You are given that cos(A) =-5/13 with A in Quadrant III, and cos(B) =8/17 with...

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You are given that cos(A) =-5/13 with A in Quadrant III, and cos(B) =8/17 with B in Quadrant I. Find cos(A + B).Give your answer as a fraction.Provide your answer below:cos (A + B))=

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