5. y/x = tanv, v = arctan(y/x),
x^2+y^2 = e^(2u), u = (1/2)ln(x^2+y^2)
z = uv = (1/2)ln(x^2+y^2) arctan(y/x)
z'
- (1/2)[y/(x^2+y^2)]ln(x^2+y^2)
z'
+ (1/2)[x/(x^2+y^2)]ln(x^2+y^2)
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