## Reciprocal Function

### A reciprocal function is a type of function that is defined by taking the reciprocal (or the multiplicative inverse) of the input variable

A reciprocal function is a type of function that is defined by taking the reciprocal (or the multiplicative inverse) of the input variable. In other words, if the original function is denoted as f(x), then its reciprocal function is denoted as g(x) = 1/f(x).

The reciprocal function is defined for all values of x except where the original function would be zero, as division by zero is undefined. Therefore, we need to consider the domain of the original function before defining the domain of its reciprocal.

To understand the behavior of a reciprocal function, it is essential to analyze its graph. The reciprocal function is often represented as a graph of a hyperbola. Let’s consider the reciprocal of a linear function f(x) = ax + b, where a and b are constants. The reciprocal function will be g(x) = 1/(ax + b).

The graph of the reciprocal function will have two branches, one on each side of the vertical asymptote, which is the line x = -b/a. The branches will approach the asymptote but will never intersect it. As x approaches positive or negative infinity, g(x) will approach zero.

The reciprocal function has some important characteristics:

1. Vertical asymptotes: The reciprocal function will have vertical asymptotes at x = -b/a. These are the values of x for which the original function becomes zero.

2. Horizontal asymptote: As x approaches positive or negative infinity, the reciprocal function approaches zero. Therefore, the x-axis acts as a horizontal asymptote.

3. Relationship with its original function: The reciprocal function has a unique relationship with its original function. If the original function is increasing or decreasing, the reciprocal function will be decreasing or increasing, respectively. The vertical asymptote of the original function becomes a zero of the reciprocal function.

4. Domain and range: The domain of the reciprocal function is the set of all real numbers excluding the values of x for which the original function is zero. The range of the reciprocal function is the set of all real numbers except for zero.

5. Symmetry: The reciprocal function is not symmetric with respect to the y-axis or the origin.

To summarize, a reciprocal function is the inverse of the original function obtained by taking the reciprocal of the input variable. Its graph is characterized by vertical asymptotes, a horizontal asymptote, and a unique relationship with its original function.

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