$\"\"$

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The function is $\"\"$ and boundary condition is $\"\"$ .

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$\"\"$

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The above equation is in the form of first order differential equation $\"\"$ .

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The above equation , $\"\"$ and $\"\"$ .

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The intigrating factor is $\"\"$ .

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Substitute $\"\"$ in the above integrate formula.

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$\"\"$

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$\"\"$

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Solution of first order linear differential equation $\"\"$ is $\"\"$ .

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$\"\"$

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$\"\"$

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Substitute $\"\"$ in the above integral function.

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$\"\"$

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Subsitute $\"\"$ in $\"\"$ .

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$\"\"$

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$\"\"$ .

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$\"\"$

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$\"\"$ .