\"\"

\

The equation is \"\".

\

Apply derivative on each side with respect to \"\".

\

\"\"

\

\"\"

\

\"\".

\

\"\"

\

\"\".

\

Again derivative on each side with respect to \"\".

\

\"\"

\

\"\"

\

\"\"

\

Substitute \"\".

\

\"\".

\

\"\"

\

The differential equation \"\" is verified.