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Let f:[0,4pi]vec[0,pi] be defined by f(x...

Let `f:[0,4pi]vec[0,pi]` be defined by `f(x)=cos^(-1)(cosx)dot` The number of points `x in [0,4pi]s a t i sfy ingt h e` equation `f(x)=(10-x)/(10)` is____

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