$\"\"$

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The trigonometric equation is $\"\"$ .

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Apply quotient identity : $\"\"$ .

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$\"\"$

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Pythagorean identity : $\"\"$ .

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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 the sine function is $\"\"$ , there are no solutions exist for $\"\"$ .

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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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Find the solutions on the interval $\"\"$ .

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

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

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Thus, the solution is $\"\"$ on the interval $\"\"$ .

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But, at $\"\"$ , tangent function is undefined.

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So, the equation $\"\"$ does not have any solutions.

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$\"\"$

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The equation $\"\"$ does not have any solutions.