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Let f:[0,3 pi] rarr[-pi/2, pi/2] be d...

Let `f:[0,3 pi] rarr[-pi/2, pi/2]` be defined by `f(x)=sin ^-1(sin x)`.Find the number of points `x in[0,3 pi]` satisfying the equation `f(x)=(9-x)/9` .

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