$\"\"$

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The definite integral is $\"\"$ , $\"\"$ .

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The maclaurin series of $\"\"$ is $\"\"$ , $\"\"$ .

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Consider $\"\"$

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Replace $\"\"$ with $\"\"$ .

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$\"\"$

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$\"\"$

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Multiply each side by $\"\"$ .

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$\"\"$

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$\"\"$

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Apply integral on each side on $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$ .

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$\"\"$

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Calculate the terms upto $\"\"$ . $\"\"$

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Here third term is $\"\"$ .

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Therefore, calculate the sum upto two terms.

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$\"\"$

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$\"\"$ .

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$\"\"$

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$\"\"$ .