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Let cos^(-1)(x) + cos^(-1)(2x) + cos^(-1...

Let `cos^(-1)(x) + cos^(-1)(2x) + cos^(-1)(3x) = pi.` .If `x` satisfies the cubic equation `ax^3 + bx^2 + cx-1=0.` then `a+b+c` has the value equal to

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