Julia: v1.9.0

Symbolics.jl: v5.3.1

Not sure if this is the intended behavior:

```
using Symbolics
@variables x
simplify(sin(x) + sin(-x))
```

returns

```
sin(x) + sin(-x)
```

instead of 0, which is really surprising. Then checked if I could write down a rewriting rule using SymbolicUtils.jl like this:

```
using SymbolicUtils
@syms a
r = @rule sin(-(~a)) => -sin(~a)
r(sin(-a))
```

which prints nothing! Am I doing something wrong here?