$\"\"$

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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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From the pythagorean identity :

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$\"\"$ .

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$\"\"$

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It is in the form of $\"\"$ .

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$\"\"$ .

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Let $\"\"$ and $\"\"$ .

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$\"\"$ .

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$\"\"$ .

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$\"\"$

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Replace the value $\"\"$ .

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$\"\"$ .

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$\"\"$

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$\"\"$

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From the pythagorean identities : $\"\"$ .

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$\"\"$

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$\"\"$

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Subustiute $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$ .