## Final Answer

## Step-by-step Solution

Problem to solve:

Solving method

The derivative of the natural logarithm of a function is equal to the derivative of the function divided by that function. If $f(x)=ln\:a$ (where $a$ is a function of $x$), then $\displaystyle f'(x)=\frac{a'}{a}$

The derivative of the linear function times a constant, is equal to the constant