The letters r and θ represent polar coordinates.

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yrnurinaf

Mathematics

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Explanation & Answer

from r = sqrt(x^2+y^2) = 1+y/sqrt(x^2+y^2) 

multiply both sdies by sqrt(x^2+y^2), we have 

x^2+y^2 = sqrt(x^2+y^2) +y, the third answer is right


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