What is the domain of f(x)= 1/(1/x) ?

The domain of f(x)= 1/(1/x) is x 0

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domain of f(x)= 1/(1/x)

domain

f (x) = \frac{1}{\frac{1}{x}}

x < 0 or x > 0

Interval Notation

(- \infty, 0) \cup (0, \infty)

Solution steps

Find undefined (singularity) points:

x = 0

The function domain

x < 0 or x > 0

f (x) = \frac{x + 3}{2 x}

y = (x - 3)^{3}

x 9 - x

\frac{x}{5 x ^{2} + 4 x - 1}

x^{4} - 4 x^{2}

What is the domain of f(x)= 1/(1/x) ?
The domain of f(x)= 1/(1/x) is x<0\lor x>0