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Which of the following is/are not functi...

Which of the following is/are not functions ([.]) and {.} denote the greatest integer and fractional part functions, respectively? (a) `1/(1n(1-|x|))` (b) `(x !)/({x})` (c)`x !{x}` (d) `(1n(x-1))/(sqrt((1-x^2)))`

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