$\"\"$

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The value of the trigonometric function $\"\"$ and $\"\"$ .

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Pythagorean identity: $\"\"$ .

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$\"\"$

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Since $\"\"$ , take $\"\"$ . $\"\"$

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Quotient identity: $\"\"$ .

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$\"\"$

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Reciprocal 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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Reciprocal identity: $\"\"$ .

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$\"\"$

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$\"\"$

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The remaining trigonometric functions are $\"\"$ , $\"\"$ ,

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