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Math Help - sin 3pi/4

  1. #1
    Member
    Joined
    Jun 2007
    Posts
    120

    sin 3pi/4

    the answer is sqrt2/2...but how is that?

    sin 3pi/4 is referencing sin 45 in the 2nd quadrant...so shouldnt the answer be 1/sqrt2?......im using specials triangles btw..
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  2. #2
    Member
    Joined
    Dec 2008
    From
    Auckland, New Zealand
    Posts
    189
    \frac{1}{\sqrt{2}} = \frac{1}{\sqrt{2}} \times \frac{\sqrt{2}}{\sqrt{2}} = \frac{\sqrt{2}}{2}

    They are the same thing!
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