Answer Posted / Ganesh Soni
Both `abs()` and `fabs()` return the absolute value of a number, but they differ in their arguments. `abs()` can be used with numbers as well as complex numbers (`complex(a, b).abs()`), while `fabs()` is used specifically for floating point numbers (`float` or `numpy.float64`) and returns the absolute value ignoring the sign, similar to `abs()`, but without the overhead of checking if the number is a complex one.
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