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Consider the function of two variables $f(x, y)=x^{2} y^{3}$(a) compute $$\Delta f=f(x+\Delta x, y+\Delta y)-f(x, y)$$,(b) Show that $\Delta f=f(x+\Delta x, y+\Delta y)-f(x, y)=D_{1} \Delta x+D_{2} \Delta y$$+\epsilon_{1} \Delta x+\epsilon_{2} \Delta y,$ where $\epsilon_{1}$ and $\epsilon_{2}$ each approach zero as both $\Delta x$ and $\Delta y$ approach zero. We shall see later in the text that $D_{1}$ and $D_{2}$ are called partial derivatives with respect to $x$ and $y$ respectively.

Calculus 1 / AB

Chapter 3

Applications of the Derivative

Section 6

Linearization and Differentials

Derivatives

Missouri State University

Campbell University

Baylor University

University of Nottingham

Lectures

04:40

In mathematics, a derivative is a measure of how a function changes as its input changes. Loosely speaking, a derivative can be thought of as how much one quantity is changing in response to changes in some other quantity; for example, the derivative of the position of a moving object with respect to time is the object's velocity. The concept of a derivative developed as a way to measure the steepness of a curve; the concept was ultimately generalized and now "derivative" is often used to refer to the relationship between two variables, independent and dependent, and to various related notions, such as the differential.

30:01

In mathematics, the derivative of a function of a real variable measures the sensitivity to change of the function value (the rate of change of the value of the function). If the derivative of a function at a chosen input value equals a constant value, the function is said to be a constant function. In this case the derivative itself is the constant of the function, and is called the constant of integration.

05:34

Consider the function defi…

05:03

Find the partial derivativ…

05:31

05:21

05:17

02:14

If $u=\left(x^{2}-y^{2}\ri…

01:04

If $u=\left(x^{2}-y^{2}\r…

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