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Suppose A and B are angles in standard position with sin(A)= 4/5 and sin(B)=-1/3 . Find the exact value of cos(A + B) if

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Suppose A and B are angles in standard position with sin(A)= 4/5 and sin(B)=-1/3 . Find the exact value of cos(A + B) if A is in Q2 and B is in Q3.

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