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[" Let A and B denote the statements "],[[A:cos alpha+cos beta+cos gamma=0],[B:sin alpha+sin beta+sin gamma=0]],[" If "cos(beta-gamma)+cos(gamma-alpha)+cos(alpha-beta)=-(3)/(2)," then "],[[" (1) A is false and "B" is true "," (4) both "A" and "B" are true "],[" (3) both "A" and "B" are false "," (4) A is true and "B" is false "]]

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