Thread: Polar Equation: Draw and Fill in chart

Draw and fill in the chart that has a row for "Theta" and a row for "r" for this polar equation: r=1-3cos(theta)

I have to fill in the 24 spots (12 for theta and 12 for r) on the chart using this polar equation: r=1-3cos(theta).

The picture given is a unit circle counting by pi/12. Please help???

Hve you been introduced to ...polar plot r=1-3cos(t) - Wolfram|Alpha ?

Thank you very much. How would I go about solving for R when cos(theta)= pi/12?

Originally Posted by Binary

Thank you very much. How would I go about solving for R when cos(theta)= pi/12?

I think you mean ... "how can I evaluate when " ?



... get out your calculator




by hand ...



... use the difference identity for cosine.

Originally Posted by skeeter

I think you mean ... "how can I evaluate when " ?



... get out your calculator




by hand ...



... use the difference identity for cosine.

Yeah I figured it out finally then just saw your post. Thank you very much. I was trying to do it by hand btw.

When I use my calculator I dont get r=0.966. I get approx r=-1.897

Originally Posted by Binary

When I use my calculator I dont get r=0.966. I get approx r=-1.897

you're correct ... I only punched in , my mistake.