Step 1:

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The expression is $\"\"$ .

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Rewrite the expression.

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$\"\"$

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The expression $\"\"$ is in the form of $\"\"$ .

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$\"\"$ can be written as $\"\"$

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$\"\"$

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Trigonometric Pythagorean identities : $\"\"$ .

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$\"\"$

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$\"\"$

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Solution:

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$\"\"$