\"\"

\

The expression is \"\".

\

Consider \"\".

\

\"\"

\

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

\

\"\"

\

\"\"

\

Divide each side by \"\".

\

\"\"

\

\"\"

\

\"\".

\

Trigonometric identity : \"\".

\

\"\"

\

Substitute  \"\" in the derivative function.

\

\"\"

\

Substitute \"\" in the equation.

\

\"\".

\

\"\"

\

\"\".

\