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## Homework Statement

Using Cauchy-Riemann equations show that f(z)=Re(z)Im(z)+i Im(z) is differentiable at only one point in C and find this point

## Homework Equations

## The Attempt at a Solution

no idea about this question , can i set Re(z)=u Im(z)=v

then U=uv V=v

and the point is o ???