$\"\"$

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The function is $\"\"$ .

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Consider $\"\"$ and $\"\"$ .

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Therefore $\"\"$ is

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$\"\"$

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Evaluate of the limit.

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$\"\"$ .

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$\"\"$

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Expanding $\"\"$ for small values of $\"\"$ then $\"\"$ .

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Substitute $\"\"$ in the above limit.

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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Substitute $\"\"$ in the above limit.

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$\"\"$ .

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$\"\"$

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$\"\"$ .