trig

if 8 tan Q=15 then sinA-cosA=?

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  1. or tan Q = 15/8

    make a diagram, and
    in quadrant I
    sin Q = 15/17 and cosQ = 8/17

    you now have sinA - cosA
    I hope you meant
    sinQ - cosQ
    = 15/17 - 8/17 = 7/17

    in quadrant III
    sinQ = -15/17 and cosQ = -8/17
    sinQ - cosQ = -15/17 + 8/17 = -7/17

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