$\"\"$

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The trignometry expression is $\"\"$ . \ \

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Substitute $\"\"$ in the trignometry expression.

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$\"\"$

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Apply the inverse trigonometric identity: $\"\"$ where $\"\"$ .

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$\"\"$ \ \

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Even-Odd property : $\"\"$ .

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$\"\"$

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$\"\"$ .

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$\"\"$

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$\"\"$ .