# Math Help - Graphing Polar Equations question

1. ## 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?

2. The secant (theta) takes on values from -1 to -infinity.
So somthing is wrong with the calculator's graph.

3. Originally Posted by mnova
The secant (theta) takes on values from -1 to -infinity.
So somthing is wrong with the calculator's graph.

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|, $\theta + \pi$) ....