$\"\"$

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(a).

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Find the value of $\"\"$ .

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Rewrite the above equation $\"\"$ .

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From the results of 74 : $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$

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Definition of inverse trigonometry identities: $\"\"$ and $\"\"$ .

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$\"\"$ .

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$\"\"$

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(b).

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$\"\"$ .

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Rewrite the above equation : $\"\"$ .

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From the results of 74 : $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$

\

$\"\"$

\

$\"\"$

\

$\"\"$

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Definition of inverse trigonometry identities: $\"\"$ and $\"\"$ .

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$\"\"$ .

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$\"\"$ .

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$\"\"$

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(a). $\"\"$ .

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(b). $\"\"$ .