$\"\"$

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The differential equation is $\"\"$ .

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$\"\"$

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Apply integral on each side.

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$\"\"$ .

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Consider $\"\"$ .

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Integration by parts: $\"\"$ .

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Here $\"\"$ and $\"\"$ .

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Integrate $\"\"$ to find $\"\"$ .

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$\"\"$

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$\"\"$ .

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$\"\"$ .

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Substitute corresponding values in the by parts formula.

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$\"\"$

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$\"\"$

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$\"\"$

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Consider $\"\"$ .

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$\"\"$ .

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Apply integration formula: $\"\"$ .

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$\"\"$ .

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

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$\"\"$ .

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The solution of differential equation is $\"\"$ . $\"\"$

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The solution of differential equation is $\"\"$ .