$\"\"$

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(a) The expression is $\"\"$ .

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Multiply numerator and denominator by $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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Apply formula $\"\"$ .

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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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(b) Find $\"\"$ for $\"\"$ near $\"\"$ .

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$\"\"$

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$\"\"$ , for $\"\"$ near $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$

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(c) Find $\"\"$ .

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Substitute $\"\"$ in $\"\"$ .

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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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(d) Using calculator the value of $\"\"$ is $\"\"$ .

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$\"\"$

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Observe that the value $\"\"$ is equal in analytical calculation and by using calculator.

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$\"\"$

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(a) $\"\"$ .

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(b) $\"\"$ .

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(c) $\"\"$ .

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(d) $\"\"$ .