SOLUTION: Angles A and B are located in the first quadrant. If sin A = 5/13 and cosB = 3/5, determine the exact value of cos(A + B).
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Question 1192652: Angles A and B are located in the first quadrant. If sin A = 5/13 and cosB = 3/5, determine the exact value of cos(A + B). Answer by Alan3354(69443) (Show Source):
You can put this solution on YOUR website! Angles A and B are located in the first quadrant. If sin A = 5/13 and cosB = 3/5, determine the exact value of cos(A + B).
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Find cos(A) and sin(B) using
Then, cos(A+B) = cos(A)*cos(B) - sin(A)*sin(B)
