the complex expression e^{ylength + iθ} when y-length is 0

In the diagram, if θ were to equal π  (180°), then the
y-length of B₂A₂, relative to O, is 0, and the value of
each expression is -1, the four expressions adding up to -4.

e^{ylength + iθ} = e^ylength (Cosθ + iSinθ) = 1 (-1 + 0)

e^iπ = -1

e^{ylength - iθ} = e^ylength (Cosθ - iSinθ) = 1 (-1 - 0)

e^-iπ = -1

e^{-ylength + iθ} = e^-ylength (Cosθ + iSinθ) = 1 (-1 + 0)

e^iπ = -1

e^{-ylength - iθ} = e^-ylength (Cosθ - iSinθ) = 1 (-1 - 0)

e^-iπ = -1