Posted by vikash on Friday, October 12, 2012 at 6:52am.
I will assume you meant
r^3 = 3r cosŲ
Use: r^2 = x^2 + y^2 and x/r = cosŲ
so if rcosŲ = x
then 3rcosŲ = 3x
and r^3 = r^2 r
= (x^2 + y^2)(x^2+y^2^(1/2)
= (x^2 + y^2)^(3/2)
r^3 + 3rcosŲ ---> (x^2 + y^2)^(3/2) = 3x
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