$\"\"$

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The function is $\"\"$ .

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The domain of a function is all possible values of $\"\"$ .

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Denominator of the function should not be the zero.

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$\"\"$

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$\"\"$ .

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

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$\"\"$

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The function $\"\"$ .

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If $\"\"$ then $\"\"$ .

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$\"\"$

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Cancel common terms.

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$\"\"$ .

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If $\"\"$ then $\"\"$ .

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$\"\"$

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Cancel common terms.

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$\"\"$ .

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$\"\"$ is undefined.

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Hence, the discontinuity at $\"\"$ is non removable.

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$\"\"$

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Non removable discontinuity is at $\"\"$ .