$\"\"$

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The given angle is $\"\"$ .

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To change to a decimal divide by 60.

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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The reference angle convert to radians, Let $\"\"$ radians.

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$\"\"$

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$\"\"$ (The exact value of $\"\"$ )

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$\"\"$

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$\"\"$

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$\"\"$

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The solution is $\"\"$ .