Calculus                3.
6 Calculating Higher‐Order Derivatives                                                           Notes
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                                Notation          1st Derivative          2nd Derivative          3rd Derivative           nth Derivative
                                      𝑦                    𝑦                     𝑦                         𝑦                      𝑦
                                     𝑓 𝑥               𝑓 𝑥                   𝑓       𝑥                 𝑓       𝑥              𝑓       𝑥
                                                        𝑑𝑦                     𝑑 𝑦                         𝑑 𝑦                    𝑑 𝑦
                                      𝑦
                                                        𝑑𝑥                     𝑑𝑥                          𝑑𝑥                     𝑑𝑥
                         Finding the 2nd derivative
                           𝑓 𝑥        𝑥     2𝑥    5𝑥           3𝑥    9                   𝑦   √𝑥    𝑥
                           𝑓 𝑥
                                                                                     𝑑𝑦
                           𝑓     𝑥
                                                                                     𝑑𝑥
                           𝑓     𝑥
                                                                                     𝑑 𝑦
                           𝑓     𝑥
                                                                                     𝑑𝑥
                         2nd Derivative with Implicit Differentiation
                         Find         for sin 𝑦   𝑥    𝑦
       3.6 Calculating Higher‐Order Derivatives
       Calculus
                                                                                                                              Practice
                 𝒅𝟐 𝒚
         Find           based on the given information.
                 𝒅𝒙𝟐
         1. 𝑦          sin 𝑥    ln 5𝑥                  2. 𝑦         𝑒 𝑥                             3. 𝑦           sin 𝑥
5.         𝑦       2𝑥    1           6.               3𝑥                    7.           𝑥𝑦
8. sin 𝑥       𝑦    2𝑥               9. 𝑒         𝑦    1                    10. ln 𝑦          5𝑥   3
Evaluate the 2nd derivative at the given point.
11. If 𝑓 𝑥      3𝑥     4𝑥 , find 𝑓      2 .                12. If 𝑓 𝑥   𝑥 ln 𝑥, find 𝑓    1 .
13. If 𝑓 𝑥        3√𝑥        , find 𝑓    4 .                    14. If       3 cos 𝑦   5𝑥, find      at 2,
15. If             , find       at      1, 2                    16. If       ln 𝑥 𝑒 , find      at 𝑒, 1
Find the derivatives of the following.
17. 𝑓 𝑥      3𝑥     4𝑥        5𝑥               18. 𝑦      4√𝑥                      19. 𝑦            𝑥
𝑓 𝑥
                                               𝑑𝑦
                                                                                   𝑦
𝑓   𝑥                                          𝑑𝑥
𝑓   𝑥                                                                              𝑦
                                               𝑑 𝑦
𝑓     𝑥                                        𝑑𝑥
                                                                                   𝑦
                                                𝟏
Given 𝒇 𝒙     𝟑𝒙𝟐        𝒙    𝟐, 𝒈 𝒙                , and 𝒉 𝒙   √𝒙 , find the following.
                                               𝒙𝟑
20. 𝑓′′ 2                                      21. 𝑔′′′    3                       22. 2ℎ′′ 4
3.6 Calculating Higher‐Order Derivatives                                                                       Test Prep
23. If 𝑓 𝑥             1            , find 𝑓′′ 40 .
         (A) 0.068
         (B) 1.350
         (C) 5.400
         (D) 6.750
    (E) 540.000
ANSWER: B
24. A curve given by the equation 𝑥                   𝑥𝑦     8 has slope given by                  . The value of     at the point
    where 𝑥 2 is
   (A)       6                     (B)       3              (C) 0                    (D) 4                (E) undefined
25. If 𝑦         𝑥𝑒 , then
  (A) 𝑒                            (B) 𝑒               (C)       𝑥       𝑛 𝑒         (D) 𝑥 𝑒              (E) 𝑥     𝑛 𝑒
ANSWER: C
26. Let 𝑔 be the function given by 𝑔 𝑥                     cos       𝑥    sin 𝑥   6. Which of the following statements is true for
    𝑦 𝑔 𝑥 ?
    (A) 𝑦          6
    (B) 𝑔          𝑥           𝑔 𝑥
    (C) 𝑔 𝑥                6       𝑔 𝑥
    (D) 𝑦              cos     𝑥         sin 𝑥
ANSWER: A