Step 1:

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The trigonometric expression is $\"\"$ .

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Divide each side by $\"\"$ .

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$\"\"$

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

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$\"\"$

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Divide each side by $\"\"$ .

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$\"\"$

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$\"\"$

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if $\"\"$ then $\"\"$ .

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if $\"\"$ then $\"\"$ .

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if $\"\"$ then $\"\"$ .

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The solution of the given expression are $\"\"$ and $\"\"$ in the interval $\"\"$ .

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Step 1:

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The trigonometric expression is $\"\"$ .

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Rewrite $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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

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Case 1:

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$\"\"$

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$\"\"$

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if $\"\"$ then $\"\"$ .

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if $\"\"$ then $\"\"$ .

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$\"\"$ is out of the interval.

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Case 2:

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$\"\"$

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$\"\"$

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if $\"\"$ then $\"\"$ .

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if $\"\"$ then $\"\"$ .

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$\"\"$ are out of the interval.

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The solution of the given expression are $\"\"$ in the interval $\"\"$ .

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