If alpha,beta,gamma are three real numbe...

If `alpha,beta,gamma` are three real numbers and `A=[1"cos"(alpha-beta)"cos"(alpha-gamma)cos(beta-alpha)1"cos"(beta-gamma)"cos"(gamma-alpha)"cos"(gamma-beta)1]` , then which of following is/are true? `A` is singular b. `A` is symmetric c. `A` is orthogonal d. `A` is not invertible

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