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[" If "alpha,beta& gamma" are real numbers,then "D=|[1,cos(beta-alpha),cos(gamma-alpha)],[cos(alpha-beta),1,cos(gamma-beta)],[cos(alpha-gamma),cos(beta-gamma),1]|=],[[" (A) "-1," (B) "cos alpha cos beta cos gamma],[" (C) "cos alpha+cos beta+cos gamma," (D) zero "]]

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