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March 30, 2017

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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).

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    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)

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