### Home > PC3 > Chapter 8 > Lesson 8.3.4 > Problem 8-144

8-144.

Let

Calculate the average rate of change from

to . Write an expression for the average rate of change from

to . Use the fact that

to show that the expression you wrote in part (b) can be rewritten as . Substitute values for the trigonometric expressions and simplify.

Use the fact that

and to evaluate .