Activity 2.4.2. Let h(x) = sec(x) and recall that sec(x) = cos(x)" a. What is the domain of h? b. Use the quotient rule to develop a formula for h'(x) that is expressed completely in terms of sin(x) and cos(x). c. How can you use other relationships among trigonometric functions to write h'(x) only in terms of tan(x) and sec(x)? d. What is the domain of h'? How does this compare to the domain of h?