To apply the Chain Rule, set as .

The derivative of with respect to is .

Replace all occurrences of with .

Since is constant with respect to , the derivative of with respect to is .

Simplify terms.

Combine and .

Cancel the common factor of .

Cancel the common factor.

Rewrite the expression.

Differentiate using the Power Rule which states that is where .

Multiply by .

Find the Derivative f(x) = natural log of 9x