Step 1:

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The trigonometric expression is $\"\"$ .

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$\"\"$ .

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If $\"\"$ , then the general solution is $\"\"$ .

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Where $\"\"$ .

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

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Then $\"\"$ .

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Substitute $\"\"$ in $\"\"$ .

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$\"\"$ .

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Substitute $\"\"$ in $\"\"$ .

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$\"\"$

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Substitute $\"\"$ in $\"\"$ .

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$\"\"$

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Substitute $\"\"$ in $\"\"$ .

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$\"\"$

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Substitute $\"\"$ in $\"\"$ .

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$\"\"$

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Substitute $\"\"$ in $\"\"$ .

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$\"\"$

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Six solutions are $\"\"$ .

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Solution :

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General solution is $\"\"$ .

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Six solutions are $\"\"$ .