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If alpha + beta + gamma = pi, then the v...

If `alpha + beta + gamma = pi`, then the value of the determinant
`|(e^(2i alpha),e^(-i gamma),e^(-i beta)),(e^(-i gamma),e^(2i beta),e^(-i alpha)),(e^(-i beta),e^(-i alpha),e^(2i gamma))|`, is

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