$\"\"$

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The integral is $\"\"$ .

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Apply double-angle identity : $\"\"$ .

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$\"\"$

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Evaluate the integral by using substitution method.

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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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$\"\"$ .

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Substitute $\"\"$ and $\"\"$ in $\"\"$ .

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$\"\"$ .

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$\"\"$

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Consider $\"\"$ .

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Evaluate the integral by using substitution method.

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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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Substitute corresponding values in $\"\"$ .

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$\"\"$ .

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Substitute $\"\"$ in above equation.

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$\"\"$

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Substitute $\"\"$ in above equation.

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$\"\"$ .

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Thus, $\"\"$ .

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$\"\"$

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$\"\"$ .