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[" 1.If "cos^(-1)alpha+cos^(-1)beta+cos^...

[" 1.If "cos^(-1)alpha+cos^(-1)beta+cos^(-1)gamma=3 pi" ,then "],[alpha(beta+gamma)+beta(gamma+alpha)+gamma(alpha+beta)" equals "],[[" (1) "1/2," 2) "1," 3) "6," 4) "12]]

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