$\"\"$

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The trigonometric equation is $\"\"$ .

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Solve for $\"\"$ .

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$\"\"$

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$\"\"$

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The general solution is $\"\"$ is $\"\"$ .

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$\"\"$

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$\"\"$ , where $\"\"$ is an integer.

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$\"\"$

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(b) $\"\"$ for interval $\"\"$ .

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$\"\"$

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Substitute the values in the interval $\"\"$ .

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$\"\"$ is true for $\"\"$ .

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$\"\"$ is true for $\"\"$ .

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$\"\"$ is true for $\"\"$ .

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$\"\"$ is true for $\"\"$ .

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$\"\"$ is false for $\"\"$ .

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The $\"\"$ is true for all values on interval $\"\"$ .

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$\"\"$

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(a) $\"\"$ , where $\"\"$ is an integer.

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(b) $\"\"$ is false for all values on interval $\"\"$ .