I'm trying to understand this one derivation but this one part keeps messing me up;(adsbygoogle = window.adsbygoogle || []).push({});

theta = tan^-1 (y/x)

r^2 = x^2 + y^2

d theta/ d x = y/ (x^2 + y^2) how did they get this line?

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# Chain rule and cylindrical coordinates

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