$\"\"$

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The integral is $\"\"$ .

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$\"\"$ .

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

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$\"\"$

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$\"\"$

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From the half angle formula $\"\"$ .

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$\"\"$

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$\"\"$

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Apply the sum and difference rule of integration : $\"\"$ .

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$\"\"$ .

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Multiply and divide the second integral by $\"\"$ .

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$\"\"$ .

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$\"\"$ .

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$\"\"$

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From the double angle formula $\"\"$ .

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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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$\"\"$ .