## FCSymmetrize

`FCSymmetrize[expr, {a1, a2, ...}]` symmetrizes expr with respect to the variables `a1,a2, ...`.

### See also

[Overview](Extra/FeynCalc.md), [FCAntiSymmetrize](FCAntiSymmetrize.md).

### Examples

```mathematica
FCSymmetrize[f[a, b], {a, b}]
```

$$\frac{1}{2} (f(a,b)+f(b,a))$$

```mathematica
FCSymmetrize[f[x, y, z], {x, y, z}]
```

$$\frac{1}{6} (f(x,y,z)+f(x,z,y)+f(y,x,z)+f(y,z,x)+f(z,x,y)+f(z,y,x))$$