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(x^{2} + y^{2}, \frac{y}{x})

(\sqrt{x^{2} + y^{2}, \tan^{- 1} \frac{y}{x}})

(x^{2} + y^{2}, \tan^{- 1} \frac{x}{y})

(\sqrt{x^{2} + y^{2}, \tan^{- 1} \frac{y}{x}})

ANS : 2

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