### Home > CALC > Chapter 4 > Lesson 4.5.1 > Problem 4-167

4-167.

Careful!

Recall that a maximum (and a minimum) is defined as a *y*-value, and that *y*-value must exist.

What does that mean about the maximum of

To find the minimum values and the point of inflection, you will need to examine *f* '(*x*) and *f* ''(*x*), and then find their respective zeros. Remember that we are only considering the the domain −2*π* ≤ *x* ≤ 2*π*.

Use the eTool below to solve the problem.

Click the link at right for the full version of the eTool: Calc 4-167 HW eTool