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Step 1:

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The trigonometric expression is $\"\"$ .

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Here, $\"\"$ in the fourth quadrant.

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Rewrite the trigonometric eqution is

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$\"\"$

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Double angle formula for trigonometric: $\"\"$ .

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Substitute $\"\"$ in the above formula. \ \

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$\"\"$

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Half angle formula for trigonometric: $\"\"$ .

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$\"\"$

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Solution:

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$\"\"$ .

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