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Math Help - Trig help

  1. #1
    carebear184
    Guest

    Trig help

    Can someone please help me find sinA if cosA=(-3/5) and A is greater than 90 degrees, but less than 180 degrees. I'm stuck. Thankyou!
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  2. #2
    Junior Member
    Joined
    Dec 2006
    Posts
    74
    Use sin^2(a)+cos^2(a)=1, and the fact that sin(a) is positive since is between 90 and 180.
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