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The angle is $\"\"$ .

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$\"\"$ ( since $\"\"$ )

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$\"\"$ ( since $\"\"$ )

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$\"\"$ .

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$\"\"$ .

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Reciprocal identity : $\"\"$ .

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$\"\"$

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$\"\"$ .

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$\"\"$ ( since $\"\"$ )

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$\"\"$ ( since $\"\"$ )

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$\"\"$ .

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Reciprocal identity : $\"\"$ .

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$\"\"$

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$\"\"$ .

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Quotient identity : $\"\"$ .

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$\"\"$

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$\"\"$ .

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Reciprocal identity : $\"\"$ .

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$\"\"$

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$\"\"$ .

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The exact values of $\"\"$ , $\"\"$ , $\"\"$ , $\"\"$ , $\"\"$ , and $\"\"$ .