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## Homework Statement

Show that f'(z) DNE

f(z) = e^x * e^-iy

## Homework Equations

so I have to show that u_x =/= v_y or v_x =/= -u_y

## The Attempt at a Solution

my question is this: what is u(x,y) and v(x,y)? is it e^x and e^-iy respectively? Thank you for your help!