3.6 Review

Let's review our differential laws by writing them down all in one place. In each of the following laws,
\[ \begin{align} u &: \Number, & v &: \Number, & c &: \Number \end{align} \]
are numbers, \( c \) is constant, and any necessary restrictions are present.
function differential law
constant \( {\displaystyle \diff (c) = 0 } \)
constant-adder \( {\displaystyle \diff (u + c) = \diff u } \)
constant-multiplier \( {\displaystyle \diff (c \mult u) = c \mult \diff u } \)
addition \( {\displaystyle \diff (u + v) = \diff u + \diff v } \)
negation \( {\displaystyle \diff (- v) = - \diff v } \)
subtraction \( {\displaystyle \diff (u - v) = \diff u - \diff v } \)
multiplication \( {\displaystyle \diff (u \mult v) = v \mult \diff u + u \mult \diff v } \)
reciprocal \( {\displaystyle \diff \biggl(\frac{1}{v}\biggr) = \frac{- 1}{v^2} \mult \diff v } \)
division \( {\displaystyle \diff \biggl(\frac{u}{v}\biggr) = \frac{1}{v} \mult \diff u - \frac{u}{v^2} \mult \diff v } \)
squaring \( {\displaystyle \diff \bigl(u^2\bigr) = 2 u \mult \diff u } \)
cubing \( {\displaystyle \diff \bigl(u^3\bigr) = 3 u^2 \mult \diff u } \)
square root \( {\displaystyle \diff \bigl(\sqrt[2]{u}\bigr) = \frac{1}{2 \mult \sqrt[2]{u}} \mult \diff u } \)
cube root \( {\displaystyle \diff \bigl(\sqrt[3]{u}\bigr) = \frac{1}{3 \mult \bigl(\sqrt[3]{u}\bigr)^2} \mult \diff u } \)
We'll uncover a few more differential laws as we study new functions. At the end of this text, you can find Summary of Abstract Differential Laws which contains an extended list of differential laws.