# Derivative 指令

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##### 指令分類 （所有指令）

Derivative[ <Function> ]

Derivative[ <Function>, <Number> ]

Derivative[ <Curve> ]

Derivative[ <Curve>, <Number> ]

## CAS 視窗

Derivative[ <Function> ]

Derivative[ <Function> ]
Returns the derivative of the function.
Derivative[ <Function>, <Number n> ]
Returns the nth derivative of the function.
Derivative[ <Curve> ]
Returns the derivative of the curve.

Derivative[ <Curve>, <Number n> ]
Returns the nth derivative of the curve.

## CAS Syntax

In CAS View only following syntax is supported:

Derivative[ <Expression f> ]
Returns derivative of f with respect to x.

`Derivative[x^2]` yields 2 x.

`Derivative[a x^3]` yields 3 a x2.
Derivative[ <Expression f>, <Variable a> ]
Returns derivative of f with respect to a.

`Derivative[a x^3, a]` yields x3.
Derivative[ <Expression f>, <Variable a>, <Number n> ]
Returns the nth derivative of f with respect to a.

`Derivative[a x^3, x, 2]` yields 6 a x.
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