$\"\"$

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The trigonometric equation is $\"\"$ .

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Rewrite the equation as $\"\"$ .

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Subtract the term $\"\"$ from each side.

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$\"\"$

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Apply zero product property.

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$\"\"$ or $\"\"$

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$\"\"$ or $\"\"$

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Since the range of cosine function is $\"\"$ , the equation $\"\"$ yields no additional solutions.

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$\"\"$

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Solve $\"\"$ .

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$\"\"$ .

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

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

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Now find the solutions on the interval $\"\"$ .

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If $\"\"$ , $\"\"$ .

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If $\"\"$ , $\"\"$ .

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If $\"\"$ , $\"\"$ .

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Thus, the solutions are $\"\"$ , $\"\"$ , and $\"\"$ on the interval $\"\"$ .

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$\"\"$

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The solutions of $\"\"$ are $\"\"$ , $\"\"$ , and $\"\"$ on the interval $\"\"$ .