$\"\"$

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(a)

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The expression is $\"\"$ .

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Use the hyperbolic function : $\"\"$

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Substitute $\"\"$ in the function $\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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The numerical value of the expression $\"\"$ is $\"\"$ .

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$\"\"$

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(b)

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The expression is $\"\"$ .

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Use the hyperbolic function : $\"\"$

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$\"\"$

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Use the natural logarithm property: $\"\"$ .

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$\"\"$

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The numerical value of the expression $\"\"$ is $\"\"$ .

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$\"\"$

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(a)

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The numerical value of the expression $\"\"$ is $\"\"$ .

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(b)

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The numerical value of the expression $\"\"$ is $\"\"$ .