Given that f(x) =1/(x-1), then find the point of discontinuity of the composite function y=f(f(x)
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f(f(x)= 1/{1-f(x)}= 1/[1-{1/(x-1)}]=( x-1)/(x-2)...
so the function y has discontinuity at x = 2
so the function y has discontinuity at x = 2
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