### Home > CALC > Chapter 8 > Lesson 8.1.4 > Problem 8-43

8-43.

Differentiate.

Quotient Rule.

(sec(5 ln *x*))

( *k*^{2}9^{3}^{k}^{−1})We know that

*k*is a variable (not a constant) because it appears in the

(sin ^{2}*x*cos*x*)Product Rule.

8-43.

Differentiate.

Quotient Rule.

(sec(5 ln *x*))

( *k*^{2}9^{3}^{k}^{−1})We know that

*k*is a variable (not a constant) because it appears in the

(sin ^{2}*x*cos*x*)Product Rule.