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[" Q."21],[" Let "cos^(-1)(x)+cos^(-1)(2...

[" Q."21],[" Let "cos^(-1)(x)+cos^(-1)(2x)+cos^(-1)(3x)=pi" .If "x" satisfies the cuble "ax^(3)+bx^(2)+cx-1=0," then "(a+b+c)/(4)" has the value oqual "]

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