$\"\"$

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The functon is $\"\"$ , Quadrant lV.

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$\"\"$ (Definition of cosine)

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

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Here x is positive in Quadrant lV and r is always positive, $\"\"$ . $\"\"$

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Using the Pythagorean theorem, To find the y.

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$\"\"$ (Appply Pythagorean theorem)

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$\"\"$ (Substitute $\"\"$ )

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$\"\"$ (Evaluate powers: $\"\"$ )

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$\"\"$ (Apply Squaring on each side)

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$\"\"$ (Subtract 9 from each side)

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$\"\"$ (Subtract: $\"\"$ )

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$\"\"$ (Apply square root on each side)

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$\"\"$ is negative in Quadrant lV. $\"\"$

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Find the six trigonometric functions.

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Substitute these values $\"\"$ .

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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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$\"\"$ ,

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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 angles are $\"\"$ , $\"\"$ , $\"\"$ , $\"\"$ , $\"\"$ , $\"\"$ .