Results 1 to 4 of 4

Math Help - Graphing Polar Equations question

  1. #1
    Newbie
    Joined
    Jan 2009
    Posts
    1

    Arrow Graphing Polar Equations question

    I have this polar equation to graph and give a value table for. The equation is:

    r=1/(1+sec(theta)) or r=1/(1+(1/cos(theta)))

    I've done a table for this equation and it doesn't match up with the graph when I put into my calculator. Basically it's giving me negative values when there aren't any negative values on the graph.

    Any ideas on what I've done wrong?
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Newbie
    Joined
    Jan 2009
    From
    Southern California
    Posts
    12
    The secant (theta) takes on values from -1 to -infinity.
    So somthing is wrong with the calculator's graph.

    Graph your equation by hand.
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Flow Master
    mr fantastic's Avatar
    Joined
    Dec 2007
    From
    Zeitgeist
    Posts
    16,948
    Thanks
    5
    Quote Originally Posted by mnova View Post
    The secant (theta) takes on values from -1 to -infinity.
    So somthing is wrong with the calculator's graph.

    Graph your equation by hand.
    The polar graph will not have negative values for r. Go to your notes to see why .... If r is negative for an angle \theta, the point is plotted at the point polar coordinates (|r|, \theta + \pi) ....
    Follow Math Help Forum on Facebook and Google+

  4. #4
    Newbie
    Joined
    Jan 2009
    From
    Southern California
    Posts
    12
    Mr Fantastic is, of course, absolutely correct.

    Paraphrasing a wise man:
    I don't mind you replying to a post; I mind you replying faster than you think.

    I have to keep that in mind.
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Graphing a polar equation?
    Posted in the Pre-Calculus Forum
    Replies: 2
    Last Post: April 19th 2011, 05:19 PM
  2. Polar Graphing
    Posted in the Trigonometry Forum
    Replies: 3
    Last Post: October 19th 2009, 05:34 AM
  3. Graphing Polar Equations:
    Posted in the Pre-Calculus Forum
    Replies: 1
    Last Post: June 8th 2009, 10:58 PM
  4. Graphing Polar Equations
    Posted in the Pre-Calculus Forum
    Replies: 3
    Last Post: September 27th 2008, 10:45 PM
  5. Graphing w/TI-85 and polar coordinates
    Posted in the Calculus Forum
    Replies: 2
    Last Post: July 25th 2007, 01:32 AM

Search Tags


/mathhelpforum @mathhelpforum