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The trigonometric equation is $\"\"$ on the interval $\"\"$ .

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$\"\"$

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Let $\"\"$ .

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$\"\"$

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$\"\"$

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

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$\"\"$ .

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The general solution is $\"\"$ .

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$\"\"$

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$\"\"$ .

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If $\"\"$ then $\"\"$ .

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$\"\"$ .

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If $\"\"$ then $\"\"$ .

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$\"\"$ .

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If $\"\"$ then $\"\"$ .

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$\"\"$ .

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

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$\"\"$ .