Question

draw an angle x in the 1st quadrant with sinx=3/5, and an angle y in the 2nd quadrant with cosy=-12/13, then determine the exact value of tan(x+y).

Answer 1

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Answer 2

in QI, cosx = 4/5
in QII, sinx = 5/13

now you can get tanx and tany, and use the formula for tan(x+y)