Q. Suppose that a function f(x) is defined for all real values of x except x=c. Can anything be said about the existence of limx→cf(x) ? Give reasons.
Function Behavior at x=c: Just because f(x) is undefined at x=c doesn't mean the limit as x approaches c doesn't exist. The limit could still exist if the function approaches a particular value from both sides as x gets closer to c.
Example with f(x)=x2−1/x−1: For example, consider the function f(x)=x−1x2−1. This function is undefined at x=1, but if you simplify it, you get f(x)=x+1, which is defined at x=1. So the limit as x approaches 1 exists and is 2.
Different Behavior on Left and Right: However, if the function f(x) behaves differently from the left side of c compared to the right side, or if it goes to infinity, then the limit as x approaches c does not exist.
Analyzing f(x) Behavior: To determine the existence of the limit, we would need to analyze the behavior of f(x) as x approaches c from both sides. Without more information about f(x), we can't say for sure whether the limit exists.
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