There are probably easier ways to reproduce this, but here's one way;
nerdamer.setVar('M', 'matrix([-(S*L1)^-1,(S*L1)^-1,1],[(S*L1)^-1,-(S*L1)^-1+(-S*C1),0],[1,0,0])');
var x = nerdamer('invert(M)');
nerdamer.setVar('XX', x);
var z = nerdamer('matget(XX, 1, 2)');
var ztex = nerdamer.convertToLaTeX(z.text());
output.appendChild(MathJax.tex2svg(ztex.toString()));
Attached image is the result drawn in Latex.
Nerdamer should realize that (1/L)/S == 1/(LS).
There are probably easier ways to reproduce this, but here's one way;