Solved: Polar coordinates p = Yr + y2, e = arctan (ylx) 13

Chapter 9, Problem 9.1.175

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Polar coordinates \(\rho=\sqrt{x^{2}+y^{2}}, \theta=\arctan (y / x)\) give \(\ell=\int_{\alpha}^{\beta} \sqrt{\rho^{2}+\rho^{\prime 2}} d \theta, \text { where } \rho^{\prime}=d \rho / d \theta\). Derive \(\rho=a(1-\cos \theta)\). Sketch this curve. Hint. Use (10) in App. 3.1.

Text Transcription:

rho=sqrt x^2+y^2. theta=arctan (y/x)

ell=Int_alpha^beta sqrt rho^2+rho’^2 d theta, theta rho’=dp/d theta

rho=a(1-cos theta)

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