$\"\"$

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The angle is $\"\"$ .

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The angle $\"\"$ is half of $\"\"$ , the angle lies in quadrant II.

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$\"\"$ (Apply half angle formula: $\"\"$ )

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

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

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$\"\"$ (Simplify)

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

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$\"\"$ (Apply half angle formula: $\"\"$ )

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

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

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$\"\"$ (Simplify)

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

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$\"\"$ (Apply half angle formula: $\"\"$ )

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

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

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$\"\"$ (Simplify)

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

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The exact values are $\"\"$ , $\"\"$ and $\"\"$ .