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AP® Calculus AB · Unit 3 · Topic 3.5

Selecting Procedures for Calculating Derivatives: Topic Checklist (Calculus AB 3.5)

Specific “I can…” statements for choosing and combining derivative rules, each linked to the guide section and practice question that shows whether you can do it.

Work through the list without notes or a calculator. If you cannot do a statement, follow its link, then come back. Guide = study guide; Practice = practice questions. This topic is shared by Calculus AB and Calculus BC.

Understanding

  • I can explain how the last operation in an expression decides which rule to use first. (Guide: “Step 2” and Figure 1; Practice Q2, Q3)
  • I can say why (fg)′ is not f′g′ and (f/g)′ is not f′/g′. (Guide: “Common misconceptions”; Practice Q1, Q3)
  • I can explain when an equation needs implicit differentiation instead of solving for y. (Guide: “Step 3”; Practice Q5(d))
  • I can explain why (f⁻¹)′(b) uses f′(a), where f(a) = b, and not f′(b). (Guide: Worked example 2(c); Practice Q4)

Skills

  • I can rewrite roots, reciprocals and single-term fractions as powers before differentiating. (Guide: “Step 1” and Worked example 1(a); Practice Q1, Q6(d))
  • I can use log properties to simplify before differentiating. (Guide: “Step 1”; Practice Q6(b), Q7)
  • I can combine the product or quotient rule with the chain rule in one calculation. (Guide: Worked example 1(b) and (c); Practice Q3, Q6(c))
  • I can apply the chain rule more than once, as in sin²(3x). (Practice Q2)
  • I can differentiate inverse trig functions with an inside function. (Guide: “Step 3”; Practice Q6(a))
  • I can apply the chain, quotient and inverse rules to values in a table. (Guide: Worked example 2; Practice Q3)

Reasoning

  • I can justify why one procedure is shorter or safer than another for a given expression. (Practice Q6(e), Q7(d))
  • I can check a derivative with a second method, a value at a point or a sign check. (Guide: Worked example 1 checks; Practice Q5(d))
  • I can recognise a limit of the form [f(a + h) − f(a)]/h as f′(a). (Guide: “A limit that is a derivative in disguise”)

All ticked? Move on to Topic 3.6: Calculating Higher-Order Derivatives, or return to the Calculus AB roadmap or the Calculus BC roadmap.

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