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27 docs|150 tests

FAQs on Continuity And Differentiability - Topic-wise Tests & Solved Examples for Mathematics

1. What is the definition of continuity in mathematics?
Ans. Continuity in mathematics refers to the property of a function where the graph of the function is a continuous, unbroken curve without any abrupt jumps, holes, or vertical lines. It means that the function can be drawn without lifting the pen from the paper.
2. How do you determine if a function is continuous at a specific point?
Ans. To determine if a function is continuous at a specific point, we need to check three conditions: 1) The function must be defined at that point. 2) The limit of the function as x approaches the given point must exist. 3) The value of the function at the given point must be equal to the limit.
3. What is the difference between continuity and differentiability?
Ans. Continuity and differentiability are related concepts but have distinct meanings. Continuity refers to the smoothness and connectedness of a function's graph, whereas differentiability focuses on the existence of the derivative of a function at a particular point. A function can be continuous but not differentiable, but if a function is differentiable, it is always continuous.
4. Can a function be differentiable but not continuous?
Ans. No, a function cannot be differentiable but not continuous. Differentiability implies continuity. If a function is differentiable at a point, it must be continuous at that point as well. Discontinuities in a function prevent it from being differentiable.
5. Are all continuous functions differentiable?
Ans. No, not all continuous functions are differentiable. While continuity is a necessary condition for differentiability, it is not sufficient. A function must also have a well-defined tangent line at each point for it to be differentiable. Functions with sharp corners or vertical tangents, for example, are continuous but not differentiable at those points.
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