$\"\"$

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The integral is $\"\"$ .

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Integrals of symmetric functions :

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If the function $\"\"$ is continuous on $\"\"$ .

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1. If $\"\"$ is even $\"\"$ , then $\"\"$ .

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2. If $\"\"$ is odd $\"\"$ , then $\"\"$ .

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$\"\"$

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Let $\"\"$ .

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$\"\"$

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Since $\"\"$ is odd $\"\"$ , $\"\"$ .

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$\"\"$

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$\"\"$ .