# Symbolics.jl Finding Coefficients of Cross Terms Problem
**URL:** https://discourse.julialang.org/t/symbolics-jl-finding-coefficients-of-cross-terms-problem/109649
**Category:** General Usage
**Tags:** question, package, symbolics
**Created:** [February 2, 2024, 10:31pm UTC](https://discourse.julialang.org/t/symbolics-jl-finding-coefficients-of-cross-terms-problem/109649 "2024-02-02T22:31:13Z")
**Posts on this page:** 2
**Page:** 1
### Author:  [@Umut\_Can\_Turhan](https://discourse.julialang.org/u/Umut_Can_Turhan)
#### Post date: [February 2, 2024, 10:31pm UTC](https://discourse.julialang.org/t/symbolics-jl-finding-coefficients-of-cross-terms-problem/109649/1 "2024-02-02T22:31:13Z")
When I try to run the following code, the print function always returns the integer 0 (zero). However, you can easily see that the coefficient of the z[1] \* z[2] term equals -2. The Symbolics.jl module is robust for just single variables, such as coefficients of z[1]^2 and z[2]^2.
```julia
using Symbolics
@variables z[1:2]
Ψ = z[1]^2 - 2 * z[1] * z[2] + z[2]^2
# Extract coefficient
coeff_value = Symbolics.coeff(Ψ, z[1]*z[2])
println(coeff_value)
```
But interestingly `Symbolics.coeff(Ψ, z[2]^0*z[1]^2)` coefficient is true. The module doesn’t work for `Symbolics.coeff(Ψ, z[1]*z[2])`. Why?
---
### Author:  [@ChrisRackauckas](https://discourse.julialang.org/u/ChrisRackauckas)
#### Post date: [February 3, 2024, 5:44pm UTC](https://discourse.julialang.org/t/symbolics-jl-finding-coefficients-of-cross-terms-problem/109649/2 "2024-02-03T17:44:42Z")
Open an issue.