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## Homework Statement

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a - a fixed non-zero real number

r=e^(a*theta), where -pi/2<theta<pi/2

**2. The attempt at a solution**

r^2=(e^(a*theta))^2

x^2 + y^2 = e^(2*a*theta)

ln(x^2 + y^2) = 2*a*theta

ln(x^2 + y^2) = 2*a*(pi+arctan(y/x))

Is this OK?