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Posted by on Sunday, May 12, 2013 at 8:07pm.

if cosx equals square root 3 over 2, find sinx

  • Math - , Sunday, May 12, 2013 at 10:43pm

    cosx = √3/2
    and we know that the cosine is positive in quadrants I and IV
    I also know that cos 30° or cos π/6 = √3/2

    so x = 30° or 330° OR π/6 , 11π/6 in radians

    then sinx = 1/2
    or
    sinx = -1/2 (because the sine is negative in IV)

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