$\"\"$

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The integral is $\"\"$ .

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$\"\"$

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From the pythagorean identity $\"\"$ . $\"\"$

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

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$\"\"$

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$\"\"$

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Consider $\"\"$ .

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Let $\"\"$ then $\"\"$ .

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$\"\"$

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Power rule of integration : $\"\"$ .

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$\"\"$

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Substitute $\"\"$ in the above equation.

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$\"\"$

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$\"\"$

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$\"\"$

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Consider $\"\"$ .

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$\"\"$

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Let $\"\"$ then $\"\"$ .

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$\"\"$

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Substitute $\"\"$ in above equation.

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$\"\"$

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Substitute equation (2) and equation (3) in equation (1).

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Thus, $\"\"$ .

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$\"\"$

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$\"\"$ .