$\"\"$

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(a).

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Find the numerical value of $\"\"$ .

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The definition of hyperbolic trigonometry : $\"\"$ .

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

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$\"\"$

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$\"\"$ .

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

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(b).

\

Find the numerical value of $\"\"$ .

\

The definition of hyperbolic trigonometry : $\"\"$ .

\

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

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$\"\"$

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$\"\"$

\

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

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$\"\"$

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(a).The numerical value of $\"\"$ is $\"\"$ .

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(b).The numerical value of $\"\"$ is $\"\"$ .