1. ## Polar r=2+3sinΘ

So in calculus 2 they have this problem that I am just stuck with

r=2+3sinΘ
I multiply both sides by r
r^2 = 2r + 3rsinΘ
that turns to be
x^2 + y^2 = 2r + 3y

x^2 + y^2 - 3y = 2r

how do I get rid of the last r?

2. Originally Posted by fhtapia
So in calculus 2 they have this problem that I am just stuck with

r=2+3sinΘ
I multiply both sides by r
r^2 = 2r + 3rsinΘ
that turns to be
x^2 + y^2 = 2r + 3y

x^2 + y^2 - 3y = 2r

how do I get rid of the last r?
$
r = \sqrt{x^2+y^2}
$