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[" If "y=cos^(-1)((1)/(x^(3)))," then "(...

[" If "y=cos^(-1)((1)/(x^(3)))," then "(dy)/(dx)=],[" (A) "(3)/(x^(4)sin[cos^(-1)((1)/(x^(3)))])],[" (B) "((3)/(x sqrt(x^(6)-1)))/((3)/(x^(4)sin[cos^(-1)((1)/(x^(3)))]))],[" (C) "(3)/(x sqrt(x^(6)+1))]

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