$\"\"$

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Let $\"\"$ be a real number and $\"\"$ be the point on the unit circle corresponding to $\"\"$ ,

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then $\"\"$ , and

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$\"\"$ .

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The point is $\"\"$ .

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$\"\"$ ,

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$\"\"$ ,

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$\"\"$ ,

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$\"\"$ ,

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$\"\"$ ,

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$\"\"$ . $\"\"$

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The exact values of six trigonometric functions are $\"\"$ , $\"\"$ ,

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$\"\"$ , $\"\"$ , $\"\"$ , and $\"\"$ .