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).  
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Find cos(A) and sin(B) using {{{sin^2(x) + cos^2(x) = 1}}}
Then, cos(A+B) = cos(A)*cos(B) - sin(A)*sin(B)