$\"\"$

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The differential equation is $\"\"$ and the initial condition 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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$\"\"$

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Apply the formula: $\"\"$ .

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$\"\"$ .

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$\"\"$

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The initial condition is $\"\"$ .

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Find the value of $\"\"$ .

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

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$ .

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

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$\"\"$ . $\"\"$

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$\"\"$ .