Asked by JO
Find cos(a+b). sin a = 3/5, a lies in Quadrant I, and cos b = 12/13, b lies in Quadrant I.
Answers
Answered by
oobleck
well, we know that
cos a = 4/5
sin b = 5/13
Now just apply the formula
cos(a+b) = cosa cosb - sina sinb
cos a = 4/5
sin b = 5/13
Now just apply the formula
cos(a+b) = cosa cosb - sina sinb
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