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Let f : [0,4π] → [0,π] be defined by f (x) = cos^-1 (cos x).

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Let f : [0,4π] → [0,π] be defined by f (x) = cos-1 (cos x). The number of points x ∈ [0, 4π] satisfying the equation f (x) = 10 - x/10 is___

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Hence, 3 points

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