$\"\"$

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The integral is $\"\"$ .

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From the trignometric subustitution, subustiute $\"\"$ and $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$

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Use the common integral $\"\"$ . $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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