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(a).

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

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

Substitute $\"\"$ in the above equation

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$\"\"$ .

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

(b).

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

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

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

$\"\"$

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

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

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