$\"\"$

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The trigonometric equation is $\"italic$ .

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$\"italic$ , let $\"begin$ and place $\"begin$ in quadrant IV.

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The point P = (x, y) = $\"begin$ = x < 0 is on a circle of radius, $\"begin$ .

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

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$\"begin$

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$\"\"$

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$\"begin$ (Subtract 3 from each side)

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$\"begin$

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$\"begin$ (x < 0)

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Then $\"italic$ . $\"\"$

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a) $\"italic$

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

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$\"equal$ (Substitute $\"italic$ )

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$\"equal$

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$\"equal$

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$\"equal$

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$\"\"$

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