# Coefficient

Coefficient[expr,form]

gives the coefficient of form in the polynomial expr.

Coefficient[expr,form,n]

gives the coefficient of form^n in expr.

# Details and Options • Coefficient picks only terms that contain the particular form specified. is not considered part of .
• form can be a product of powers.
• Coefficient[expr,form,0] picks out terms that are not proportional to form.
• Coefficient works whether or not expr is explicitly given in expanded form.

# Examples

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## Basic Examples(1)

Find coefficients of polynomials:

## Scope(4)

Find a coefficient at x:

Find a coefficient at a power of x:

Find the free term in a polynomial:

Find a coefficient at a multivariate monomial:

## Options(1)

### Modulus(1)

Find a coefficient over the integers modulo 2:

## Properties & Relations(2)

CoefficientList gives a list of all polynomial coefficients:

The same list of coefficients obtained using Coefficient and Exponent:

For multivariate polynomials CoefficientList gives a tensor of the coefficients:

CoefficientArrays gives the list of arrays of polynomial coefficients ordered by total degree:

The coefficient of x y3:

In cl the coefficient of x^a y^b is the element at position {a+1,b+1}:

In ca the position of this coefficient is a+b+1 followed by a 1s and b 2s (1 and 2 indicate the first and second variables):

## Possible Issues(1)

Coefficient treats transcendental powers as being algebraically unrelated to algebraic powers:

Coefficient treats distinct transcendental powers as being algebraically unrelated to one another: