$\"\"$

\

The differential equation $\"\"$ and change of varible $\"\"$

\

Rewrite the equation.

\

$\"\"$

\

Substitute $\"\"$ in the above equation.

\

$\"\"$

\

Consider $\"\"$ .

\

Differentiate on each side with respect to $\"\"$ .

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

Substitute $\"\"$ in the above equation.

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

Integrate on each side.

\

$\"\"$

\

Integral formula: $\"\"$ .

\

$\"\"$ .

\

Take exponential of each side.

\

$\"\"$

\

$\"\"$

\

Let $\"\"$ .

\

$\"\"$

\

Substitute $\"\"$ in the above equation

\

$\"\"$

\

$\"\"$ .

\

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

\

$\"\"$

\

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