$\"\"$

\

The function is $\"\"$ .

\

Apply derivative the function with respect to $\"\"$ .

\

$\"\"$

\

Sum rule of derivative: $\"\"$ .

\

$\"\"$

\

Constant rule of derivative : $\"\"$ .

\

Derivative of sine function: $\"\"$ .

\

$\"\"$

\

$\"\"$ .

\

$\"\"$

\

$\"\"$ .