Step 1 :

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Find $\"\"$ .

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Rewrite the integral as $\"\"$

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Evaluate $\"\"$ by using substitution method.

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

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Substitute corresponding values in $\"\"$ .

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$\"\"$

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

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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, $\"\"$ .