$\"\"$

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The trigonometric expression is $\"\"$ .

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$\"\"$

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Using formula: $\"\"$ .

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$\"\"$

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Factorize the numerator and denominator.

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$\"\"$

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$\"\"$

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$\"\"$

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Cancel common terms.

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$\"\"$

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$\"\"$ $\"\"$ .

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$\"\"$

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$\"\"$ .