$\"\"$

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The integral is $\"\"$ .

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The trignometric identity is $\"\"$ .

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$\"\"$

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$\"\"$ .

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Use the following identity : $\"\"$ .

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$\"\"$ .

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$\"\"$

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Apply integral subustitution $\"\"$ .

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Where $\"\"$ and $\"\"$ and $\"\"$ .

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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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$\"\"$ .

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Subustiute $\"\"$ .

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$\"\"$

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$\"\"$

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