Algebra-2

Question Analysis
This question involves the fundamental definition of the tangent function and its domain restrictions.The main focus is on identifying the value of that makes undefined.

Key Concept Explanation
The tangent function is defined as . A fraction is undefined when its denominator equals 0, so is undefined when .

Step-by-step Solution
1. Recall the definition: .
2. Recognize that division by 0 is undefined in mathematics.
3. Conclusion:

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