$\"\"$

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The limit expression is $\"\"$ .

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By direct substitution, $\"\"$ .

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Since this is an indeterminate form, rationalise and dividing out any common factors.

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$ .

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$\"\"$ .

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$\"\"$

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Check:

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Graph the function $\"\"$ .

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$\"\"$

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Observe the graph:

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As $\"\"$ tends to $\"\"$ , the function value approaches to $\"\"$ .

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$\"\"$ .

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$\"\"$

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$\"\"$ .