Results 1 to 3 of 3

Math Help - Expressing product in polar and retangular form:

  1. #1
    Newbie
    Joined
    Dec 2007
    Posts
    11

    Expressing product in polar and retangular form:

    I have to convert this to polar and rectangular form:
    (8 cis pi/3)(1/2 cis (-2pi/3)) = 4 cis 5pi/3, 2-2i (sq. root 3)

    I just don't know how they got that answear...

    I know you use the formula: rs cis (a + b) so i understand how they got 4 cis, but idk how they got the 5pi/3. And then from there i know you use r (cos theta + (sin theta)i) but i jst don't get this prob...

    thanks in advance for the help
    Follow Math Help Forum on Facebook and Google+

  2. #2
    MHF Contributor

    Joined
    Aug 2006
    Posts
    18,922
    Thanks
    1762
    Awards
    1
    \begin{array}{l}<br />
 \frac{\pi }{3} + \frac{{ - 2\pi }}{3} = \frac{{ - \pi }}{3} \approx \frac{{5\pi }}{3} \\ <br />
 \cos \left( {\frac{{ - \pi }}{3}} \right) = \cos \left( {\frac{{5\pi }}{3}} \right) = \frac{1}{2}\;\& \;\sin \left( {\frac{{5\pi }}{3}} \right) = \frac{{ - \sqrt 3 }}{2} \\ <br />
 \end{array}
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Newbie
    Joined
    Dec 2007
    Posts
    11

    Talking

    oh WOW!! Now I just feel stupid, lol, that was way easier than I made it. THANK YOU for helping me
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. [SOLVED] Product of complex numbers in polar form
    Posted in the Pre-Calculus Forum
    Replies: 4
    Last Post: July 19th 2011, 09:03 AM
  2. Expressing complex numbers in polar form.
    Posted in the Calculus Forum
    Replies: 7
    Last Post: March 26th 2011, 07:39 PM
  3. Expressing a equation in polar coordinates.
    Posted in the Calculus Forum
    Replies: 3
    Last Post: May 4th 2010, 05:11 AM
  4. Expressing in another form
    Posted in the Algebra Forum
    Replies: 7
    Last Post: April 16th 2010, 04:51 AM
  5. Find a product - give answer in polar form
    Posted in the Pre-Calculus Forum
    Replies: 2
    Last Post: March 3rd 2009, 07:33 AM

Search Tags


/mathhelpforum @mathhelpforum