Thread: Converting Rectangular to Polar

I am having a brain fade today, and just really need to make sure I am doing this correctly.

i am given ... Convert the rectangular equation x^2 + y^2 - 2y = 0

I think the answer is -2sin(theta) however I am missing a step to proove it.

and one other one on the reverse side... convert polar to rectangular

r = (2/(2sin(theta) - 3cos(theta)))

I am lost on that one.
any help is greatly appreciate

Originally Posted by megabust

I am having a brain fade today, and just really need to make sure I am doing this correctly.

i am given ... Convert the rectangular equation x^2 + y^2 - 2y = 0

I think the answer is -2sin(theta) however I am missing a step to proove it.

and one other one on the reverse side... convert polar to rectangular

r = (2/(2sin(theta) - 3cos(theta)))

I am lost on that one.
any help is greatly appreciate

Straight forward substitution: . Therefore ....

I guess I assumed since it was easy that I was missing something.

And on the second one I figured out that I just multiply by the denom to get the form I need ... thanks for your help.