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Let cos^(-1)(x)+cos^(-1)(2x)+cos^(-1)(3x...

Let `cos^(-1)(x)+cos^(-1)(2x)+cos^(-1)(3x)b epidot` If `x` satisfies the equation `a x^3+b x^2+c x-c_1=0,` then the value of `(b-a-c)` is_________

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