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The trigonometric equation is $\"\"$ .

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$\"\"$

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The general solution of $\"\"$ is $\"\"$ , where $\"\"$ is an integer.

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$\"\"$

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The general solution is $\"\"$ , where $\"\"$ is an integer.

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For $\"\"$ , $\"\"$ .

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For $\"\"$ , $\"\"$ .

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For $\"\"$ , $\"\"$ .

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For $\"\"$ , $\"\"$ .

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For $\"\"$ , $\"\"$ .

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The solutions in the interval $\"\"$ are $\"\"$ .

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The solution set is $\"\"$ .