Asked by Joanie

I have to graph the following:

2 = rcos(theta-20 degrees). I put it in the form r = 2/cos(theta-20degrees). Is this correct? I am having trouble with my table of values.
I would appreciate your help. Thanks.
Answered by drwls
Yes that is OK. It looks like this will simplify to the equation for a straight line that is perpendicular to the line theta = 20 degrees and goes through r = 2, theta = 20 (x = 1.879, y = 0.684)

Expand the cosine function to
cos theta cos 20 + sin theta sin 20
and you have
2 = x cos 20 + y sin 20
which is the equation of a straight line.
Answered by Joanie
Thank you for helping.

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