something is undefined when the answer simply doesn't exist. for example, what in the limit of sin(x) as x approaches infinity? Since the function sin(x) oscillates back and forth for eternity, there is no limit. You simply can't put a final point on something that never stop moving back and forth, so the answer is undefined.
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Undefined means that it is not possible to determine the answer of the question. For example: 18/0 - you can not divide anything by zero (0). Therefore the answer of this question is Undefined of Undefinable.
if your a maths teacher or anything to do with maths.
The slope of any vertical Line is undefined because anything divided by zero is undefined.
Anything divided by 0 is UNDEFINED thus its not possible e.g. x/0 = undefined x= any number
Undefined: You cannot divide by zero