$\"\"$

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The trigonometric equation is $\"\"$ .

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$\"\"$ and $\"\"$ lies in fourth quadrant.

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The point $\"\"$ is on the circle of radius $\"\"$ .

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$\"begin$

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$\"begin$

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$\"begin$

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$\"\"$ .

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Since $\"\"$ lies in fourth quadrant, $\"\"$ is positive.

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Thus, $\"\"$ .

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$\"\"$

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(a) Find $\"italic$ .

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Apply Double-angle formula: $\"\"$ .

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

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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The exact value of $\"italic$ $\"\"$ .

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$\"\"$

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(b) Find $\"italic$ .

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Apply Double-angle formula: $\"italic$ .

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

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$\"\"$

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$\"\"$

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$\"\"$

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$\"equal$

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The exact value of $\"italic$ $\"equal$ .

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$\"\"$

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(c) Find $\"italic$ .

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Apply Half-angle formula: $\"italic$ .

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Substitute $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$

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The exact value of $\"italic$ $\"\"$ .

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$\"\"$

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(d) Find $\"italic$ :

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Apply Half-angle formula: $\"italic$ .

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Substitute $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$

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The exact value of $\"italic$ $\"\"$ .

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$\"\"$

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(a) The exact value of $\"italic$ $\"\"$ .

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(b) The exact value of $\"italic$ $\"equal$ .

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(c) The exact value of $\"italic$ $\"\"$ .

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(d) The exact value of $\"italic$ $\"\"$ .