$\"\"$

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The function $\"\"$ .

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Observe the graph:

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The left hand limit $\"\"$ .

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$\"\"$ .

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The right hand limit $\"\"$ .

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$\"\"$

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$\"\"$ .

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Hence the function is not continuous at $\"\"$ .

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The function has discontinuous at $\"\"$ .

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$\"\"$

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Discontinuous at $\"\"$ .