1.

The value of x for which Cos^(-1)(cos4) gt 3x^(2)-4x is

Answer»

`(0,(2+sqrt(6pi-8))/3)`
`((2+sqrt(6pi-8))/3,0)`
`(-2,2)`
`((2-sqrt(6pi-8))/3,(2+sqrt(6pi-8))/3)`

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