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Equation of unit circle $\"\"$ .

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The point $\"\"$ is in the fourth quadrant.

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Substitute $\"\"$ in $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$

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Take square root on each side.

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$\"\"$ .

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Since the point is in fourth quadrant, take $\"\"$ .

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$\"\"$

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The value of $\"y$ .