$\"\"$

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The integral function is $\"\"$ .

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Rewrite the function is

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$\"\"$

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$\"\"$

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Let $\"\"$ .

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Apply derivative on each side with respect to $\"\"$ .

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$\"\"$

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$\"\"$

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Substitutes $\"\"$ and $\"\"$ in integral function.

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$\"\"$

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$\"\"$

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Let $\"\"$

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Apply derivative on each side with respect to $\"\"$ .

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$\"\"$

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$\"\"$

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Substitutes $\"\"$ and $\"\"$ in integral function.

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$\"\"$

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Trignometry identity $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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Integration reduction of $\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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Common integral of $\"\"$

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$\"\"$ .

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Substitute $\"\"$ in above equation.

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$\"\"$

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$\"\"$

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$\"\"$

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Substitute $\"\"$ in above equation.

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$\"\"$

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$\"\"$ .

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$\"\"$

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$\"\"$ .