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Math Help - Trig. Form Of A Complex Number

  1. #1
    Member >_<SHY_GUY>_<'s Avatar
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    Trig. Form Of A Complex Number

    cos(7pi/4) + i sin(7pi/4)/ cos pi + i sin pi

    now this im just stuck on
    Last edited by >_<SHY_GUY>_<; June 5th 2008 at 09:21 PM.
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  2. #2
    Flow Master
    mr fantastic's Avatar
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    Quote Originally Posted by >_<SHY_GUY>_< View Post
    cos(7pi/4) + i sin(7pi/4)/ cos pi + i sin pi

    now this im just stuck on
    What are you trying to do? Simplify and express in Cartesian form? Then note:

    \cos \left( \frac{7 \pi}{4} \right) + i \sin \left( \frac{7 \pi}{4} \right) = \frac{1}{\sqrt{2}} - \frac{i}{\sqrt{2}}.

    \cos \pi + i \sin \pi = -1.

    You must make it your business to learn the exact values of sin and cos of important special angles.
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