### Home > CALC > Chapter 8 > Lesson 8.2.1 > Problem 8-72

8-72.

Is there anywhere within *a* < *x* < *c* in which the derivative does not exist?

Check all three conditions of continuity.

A positive derivative means that *f*(*x*) is increasing.

8-72.

Is there anywhere within *a* < *x* < *c* in which the derivative does not exist?

Check all three conditions of continuity.

A positive derivative means that *f*(*x*) is increasing.