SOLUTION: What is the rectangular form of this polar equation r=9/1-3cos(theta) ?

Question 887661: What is the rectangular form of this polar equation r=9/1-3cos(theta) ?
Answer by Edwin McCravy(20063) (Show Source): You can put this solution on YOUR website!
What is the rectangular form of this polar equation r=9/1-3cos(theta) ?

Always substitute for trig functions first, then simplify.
Always wait till last to substitute for r.



Substitute  for 





Multiply right side by 





Multiply both sides by 



Divide both sides by r





Finally we substitute  for 



Square both sides:







Edwin

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