$\"\"$

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The functions are $\"\"$ and $\"\"$ .

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Definition of hyperbolic functions:

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1. $\"\"$ .

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2. $\"\"$ .

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$\"\"$

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

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

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$\"\"$

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$\"\"$ .

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$\"\"$

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(b) The function is $\"\"$ .

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

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$\"\"$

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$\"\"$ .

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$\"\"$

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(a) $\"\"$

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(b) $\"\"$