$\"\"$

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The value of the trigonometric function $\"\"$ and $\"\"$ in quadrant III.

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Pythagorean identity : $\"\"$ .

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$\"\"$

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Since $\"\"$ in quadrant III, take $\"\"$ . ( $\"\"$ ) $\"\"$

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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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$\"\"$

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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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$\"\"$

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

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