To determine the domain of a function, we need to identify the values of \( x \) for which the function is defined. The presence of an open point often indicates a point where the function is not defined or where there is a discontinuity.
If you have a specific function in mind, please provide its expression, and I can help identify its domain, including how any open points affect it. Generally, here are some common considerations when finding the domain:
- Rational Functions: Values that make the denominator zero are excluded from the domain.
- Square Roots: The expression inside a square root must be non-negative (greater than or equal to zero), so any values that make it negative are excluded.
- Logarithmic Functions: The argument of a logarithm must be positive; therefore, any values that make it zero or negative are excluded.
- Trigonometric Functions: Some trigonometric functions have special cases (e.g., tangent and secant are undefined for certain values).
Consider how an open point (often denoted with a parenthesis, like in interval notation) indicates a value that is not included in the domain. For example, in the interval notation \( (-\infty, a) \cup (a, \infty) \), the point \( a \) is excluded from the domain, meaning the function does not take the value \( a \).
If you specify the function, I can provide a detailed analysis based on these principles.
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