**Unit 3 covers the Chain Rule, differentiation techniques that follow from it, and higher order derivatives.** (CED – 2019 p. 67 – 77). These topics account for about 9 – 13% of questions on the AB exam and 4 – 7% of the BC questions.

**Topics 3.1 – 3.6**

**Topic 3.1 The Chain Rule.** Students learn how to apply the Chain Rule in basic situations.

**Topic 3.2 Implicit Differentiation.** The Chain Rule is used to find the derivative of implicit relations.

**Topic 3.3 Differentiation Inverse Functions. ** The Chain Rule is used to differentiate inverse functions.

**Topic 3.4 Differentiating Inverse Trigonometric Functions. **Continuing the previous section, the ideas of the derivative of the inverse are applied to the inverse trigonometric functions.

**Topic 3.5 Selecting Procedures for Calculating Derivatives. **Students need to be able to choose which differentiation procedure should be used for any function they are given. This is where you can review (spiral) techniques from Unit 2 and practice those from this unit.

**Topic 3.6 Calculating Higher Order Derivatives. **Second and higher order derivatives are considered. Also, the notations for higher order derivatives are included here.

Topics 3.2, 3.4, and 3.5 will require more than one class period. You may want to do topic 3.6 before 3.5 and use 3.5 to practice all the differentiated techniques learned so far. The suggested number of 40 – 50-minute class periods is about 10 – 11 for AB and 8 – 9 for BC. This includes time for testing etc.

**Posts on these topics include:**

The Power Rule Implies Chain Rule

Experimenting with CAS – Chain Rule

Implicit Differentiation of Parametric Equations

This is the third in a series of posts discussing the ten units in the 2019 Course and Exam Description. Other posts will appear during the year.

2019 CED – Unit 1: Limits and Continuity

2019 CED – Unit 2: Differentiation: Definition and Fundamental Properties.