# Difference between revisions of "Derivative"

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The [[chain rule]] states that the derivative of any <math>\displaystyle ax^n</math> is <math>\displaystyle anx^{n-1}</math> | The [[chain rule]] states that the derivative of any <math>\displaystyle ax^n</math> is <math>\displaystyle anx^{n-1}</math> | ||

− | To find the derivative of <math>\displaystyle f(x) \cdot g(x)</math> we cannot do what we did with addition. We must instead use the [[product rule]]: <math>\displaystyle (f | + | To find the derivative of <math>\displaystyle f(x) \cdot g(x)</math> we cannot do what we did with addition. We must instead use the [[product rule]]: <math>\displaystyle (f \cdot g)' = f'g + g'f</math> |

The [[quotient rule]] states that <math>\displaystyle (\frac{f}{g})' = \frac{f'g - fg'}{g^2}</math> | The [[quotient rule]] states that <math>\displaystyle (\frac{f}{g})' = \frac{f'g - fg'}{g^2}</math> |

## Revision as of 22:06, 9 September 2006

The **derivative** of a function is defined as the instantaneous rate of change of the function with respect to one of the variables. Note that not every function has a derivative.

## Notation

The derivative of f(x) can be expressed in several ways including:

## Finding the Derivative

For any constant, the derivative is 0.

For any monomial , the derivative is n.

Note that when we take the derivative of any polynomial , we can take the derivative of each addend and then add these to find the derivative of the polynomial.

The chain rule states that the derivative of any is

To find the derivative of we cannot do what we did with addition. We must instead use the product rule:

The quotient rule states that

The following pages provide additional information on derivatives.

- Notations
- Formal definition of the derivative
- Formulas

## See also

*This article is a stub. Help us out by expanding it.*