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f(x)=cos^(-1)(x-x^2)+sqrt(1-1/(|x|))+1/[...

`f(x)=cos^(-1)(x-x^2)+sqrt(1-1/(|x|))+1/[[x^2-1])` then domain of `f(x)` is (where [x] is G.I.F.) `[sqrt(2),(1+sqrt(5))/2]` (2) `(-sqrt(2),(1-sqrt(5))/2]` `(sqrt(2),(1+sqrt(5))/2]` (4) `(1,2)`

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