Definition:Implicit Differentiation
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Definition
Implicit differentiation is the differentiation of an implicit function with respect to the independent variable.
Examples
Arbitrary Example
Consider the implicit function:
- $(1): \quad y^3 + 2 x^2 y + 8 = 0$
Using the technique of implicit differentiation, $(1)$ is differentiated with respect to $x$ thus:
- $3 y^2 \dfrac {\d y} {\d x} + 4 x y + 2 x^2 \dfrac {\d y} {\d x} = 0$
from the Product Rule for Derivatives and the Power Rule for Derivatives.
This can then be algebraically manipulated to arrive at:
- $\dfrac {\d y} {\d x} = -\dfrac {4 x y} {3 y^2 + 2 x^2}$
Also see
- Results about implicit differentiation can be found here.
Sources
- 1998: David Nelson: The Penguin Dictionary of Mathematics (2nd ed.) ... (previous) ... (next): implicit differentiation
- 2008: David Nelson: The Penguin Dictionary of Mathematics (4th ed.) ... (previous) ... (next): implicit differentiation