# Reduced form of symbolic expressions

I am working in symbolic ring with two symbols: q and h. The relation between them is $q=e^h$. I want to do some algebra of matrices with symbolic entries. The entries of the input matrices consist of both q and h. I want that the entries of the output matrix to only contain q i.e. any expression in h should be converted into expressions in q. The following is my code:

```
q = SR.var('q')
h = SR.var('h')
relation = q == exp(h)
Q = matrix(SR,[[0,0,0,e^(-h)+e^(h)],[1,0,1,0],[-e^h,0,e^(-h),0],[0,1,0,0]])
Qi= Q.inverse()
R=matrix(SR,[[q,0,0,0],[0,q-q^-1,1,0],[0,1,0,0],[0,0,0,q]])
print(Qi*R.subs({e^h:q},{e^-h:q^-1}).simplify_full())
```

Here is the output:

```
[ 0 -(q^2 - 1)*(e^h/(e^(-h) + e^h) - 1)/q - 1/(e^(-h) + e^h) -e^h/(e^(-h) + e^h) + 1 0]
[ 0 0 0 q]
[ 0 (q^2 - 1)*e^h/(q*(e^(-h) + e^h)) + 1/(e^(-h) + e^h) e^h/(e^(-h) + e^h) 0]
[ q/(e^(-h) + e^h) 0 0 0]
```

How can I fix this? If I add .subs(..) at the end of both the matrices then all h expressions are changed into expressions of q. However they are still not reduced, for example I get expressions like below

```
-q/(q^2 + 1) + (q^2 - 1)/((q^2 + 1)*q)
```