basically I have to simplify in Cadabra
$\frac{1}{k.p~~k.(p+q) }+\frac{1}{k.q~~k.(p+q) }$ which is equal to $\frac{1}{k.p~~k.q }$

What I tried is

```
m:=1/((p_{c}+q_{c})k_{c}*(q_{f})k_{f});
n:=1/((p_{c}+q_{c})k_{c}*(p_{f})k_{f});
w:=@(m)+@(n);
distribute(_);
canonicalise(_);
rename_dummies(_);
collect_factors(_);
```

But its not helping.

The reason why I am asking these question is that I have a factor which involves simplification of such expressions.and I have to check gauge invariance of these factors with polarisation tensors also added.So the expressions gets complicated more.can I simplify such expressions in Cadabra