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2-iy = x

2-x/i = y

2-x/y = i

you need to start with
\[\frac{1}{2}(e^{iz}+e^{-iz})=2\]

typo i mean
\[e^{2iz}-4e^{iz}+1=0\]

ohh. ic. thx.

yw

cos never be 2 in maths

-1