# Symbols in Symbol Utilities

**URL:** <https://discourse.julialang.org/t/symbols-in-symbol-utilities/49498>\
**Category:** General Usage\
**Created:** [November 3, 2020, 2:37am UTC](https://discourse.julialang.org/t/symbols-in-symbol-utilities/49498 "2020-11-03T02:37:14Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![brett\_knoss](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/brett_knoss/32/13050_2.png) [@brett\_knoss](https://discourse.julialang.org/u/brett_knoss)\
**Post date:** [November 3, 2020, 2:37am UTC](https://discourse.julialang.org/t/symbols-in-symbol-utilities/49498/1 "2020-11-03T02:37:14Z")

</div>

I’m trying to use various CAS packages. I tried to follow the instructions for. Symbolic Utils

```julia
Using SymbolicUtils

@syms x

diff(x^2+x,x)

```

and I get

```julia
ERROR: MethodError: no method matching diff(::Term{Number}, ::Sym{Number})
Stacktrace:
 [1] top-level scope at REPL[70]:1

```

when I run

```julia
using SymbolicUtils
using SymEngine

x=symbols(:x)
SymbolicUtils.diff(x^2+x,x)

```

I get the correct result, 2x+1.