Q1(c) (ii) Use the Cauchy-Riemann Equations to show that the function
f (x + iy) = x2 + 4y + y2 + i3xy + i4x is differentiable only at 8i/5.
Cauchy-Riemann Equations and Differentiability are investigated. The solution is detailed and well presented. The response received a rating of "5/5" from the student who originally posted the question.