$\"\"$

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The differential equation is $\"\"$ , $\"\"$ .

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$\"\"$ .

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$\"\"$

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Apply integral on each side.

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$\"\"$ .

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Integration by parts: $\"\"$ .

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Integration formula: $\"\"$ .

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$\"\"$ .

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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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Find constant value.

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The condition $\"\"$ .

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

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$\"\"$

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Substitute $\"\"$ in equation $\"\"$ .

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$\"\"$ .

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

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$\"\"$

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$\"\"$ .