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Also, if you have a complex number, z, how do you find it's magnitude? For example, e^(j*pi*t - pi/2). In my book when they square the the magnitude of a complex number they multiply by the conjugate (e.g. |z|^2 = e^(j*pi*t - pi/2) * e^(-j*pi*t + pi/2) Why is this? Thanks for any help.