## How do you take the partial derivative with respect to X?

First, take the partial derivative of z with respect to x. Then take the derivative again, but this time, take it with respect to y, and hold the x constant. Spatially, think of the cross partial as a measure of how the slope (change in z with respect to x) changes, when the y variable changes.

**What is the partial derivative of xy with respect to x?**

Algebraically, we can think of the partial derivative of a function with respect to x as the derivative of the function with y held constant. Geometrically, the derivative with respect to x at a point P represents the slope of the curve that passes through P whose projection onto the xy plane is a horizontal line.

**What are second partial derivatives?**

For a function of more than two variables, we can define the second-order mixed partial derivative with respect to two of the variables (in a particular order) in the same manner as for a function of two variables, where we treat the remaining variables as constant.

### What do you mean by partial differentiation?

In mathematics, a partial derivative of a function of several variables is its derivative with respect to one of those variables, with the others held constant (as opposed to the total derivative, in which all variables are allowed to vary). Partial derivatives are used in vector calculus and differential geometry.

**What is the derivative of y with respect to x?**

Given y = f(x) g(x); dy/dx = f’g + g’f. Read this as follows: the derivative of y with respect to x is the derivative of the f term multiplied by the g term, plus the derivative of the g term multiplied by the f term.

**Which is the second partial derivative of a function?**

The second partial derivatives fxy and fyx are mixed partial derivatives. The notation of second partial derivatives gives some insight into the notation of the second derivative of a function of a single variable. If y = f(x), then f ″ (x) = d2y dx2.

#### How to calculate partial derivatives in equation 13.3?

Use Equations 13.3.1 and 13.3.2 from the definition of partial derivatives. The idea to keep in mind when calculating partial derivatives is to treat all independent variables, other than the variable with respect to which we are differentiating, as constants. Then proceed to differentiate as with a function of a single variable.

**Which is partial of F with respect to X?**

(This rounded “d” is usually called “partial,” so ∂ f / ∂ x is spoken as the “partial of f with respect to x .”) This is the first hint that we are dealing with partial derivatives. Second, we now have two different derivatives we can take, since there are two different independent variables.

**Which is the derivative of Y with respect to X?**

We have studied in great detail the derivative of y with respect to x, that is, d y d x, which measures the rate at which y changes with respect to x. Consider now z = f(x, y). It makes sense to want to know how z changes with respect to x and/or y.