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[" then "lambda=],[" Let "cos^(-1)(x)+co...

[" then "lambda=],[" Let "cos^(-1)(x)+cos^(-1)(2x)+cos^(-1)(3x)=pi" .If x satisfies the equation "ax^(3)+bx^(2)+cx-1=0" ,then the value "],[" of "(b-a-c)=3]

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