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September 14, 2012

Anonymous asked: hi, i submitted the complex questions, number 27 has the equation: e^(iz) = cos (z) - i sin (z), it should alctually read: e^(-iz) = cos (z) - i sin (z)

but I only have this question in my inbox

e^(-iz) = cos(-iz) + sin (-iz) = cos(iz) - sin(iz) since cos (-theta) = cos(theta) and sin(-theta) = - sin(theta)

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