$\"\"$

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The trigonometric equation is $\"\"$ .

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To solve $\"\"$ on a calculator, first set the mode to radians.

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If $\"\"$ .

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$\"\"$ .

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One solution of the equation $\"\"$ is $\"\"$ .

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

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Thus, $\"\"$ .

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Substitute $\"\"$ in the above expression.

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$\"\"$

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$\"\"$ is not in the interval $\"\"$ .

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$\"\"$ is another solution of the equation $\"\"$ .

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The solution set for $\"\"$ is $\"\"$ . $\"\"$

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The solution set for $\"\"$ is $\"\"$ .