$\"\"$

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The function is $\"\"$ .

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The left hand limit near $\"\"$ :

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$\"\"$

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The right hand limit near $\"\"$ :

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$\"\"$ \ \

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$\"\"$

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The left hand and right hand limits are equal.

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$\"\"$ .

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The limit exist at $\"\"$ , $\"\"$ .

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From the function $\"\"$ .

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$\"\"$ .

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Therefore, $\"\"$ is not continuous at $\"\"$ .

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So $\"\"$ does not exist.

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$\"\"$

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$\"\"$ does not exist.