Question: Euler's formula QUIRK

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exp(I*n*Pi)+exp(-I*n*Pi)"(=)"2*cos(Pi*n)

exp(-I*n*Pi)+exp(I*n*Pi) = 2*cos(n*Pi)"(->)"false

exp(-I*n*Pi)-exp(I*n*Pi)"(=)"-(2*I)*sin(Pi*n)

exp(-I*n*Pi)-exp(I*n*Pi) = -(2*I)*sin(n*Pi)"(->)"false``

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