19.4. (a) Show that, when z is represented by polar coordinates, the C-R conditions on a function f(z) are 1 Əv ƏV = -r. dr r d0 dr ' where U and V are the real and imaginary parts of f(z) written in...

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My question is about Complex Derivative and Integral. I showed in the upload photo. Thank you very much.

Extracted text: 19.4. (a) Show that, when z is represented by polar coordinates, the C-R conditions on a function f(z) are 1 Əv ƏV = -r. dr r d0 dr ' where U and V are the real and imaginary parts of f(z) written in polar coordinates.