Let f(x)=sin^(23)x-cos^(22)xa n dg(x)=1+...

Let `f(x)=sin^(23)x-cos^(22)xa n dg(x)=1+1/2tan^(-1)|x|` . Then the number of values of `x` in the interval `[-10pi,8pi]` satisfying the equation `f(x)=sgn(g(x))` is __________

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