[A question was posted on Math.SE](http://math.stackexchange.com/q/592416/1543) late last year, which I [noted is very similar to a question posted here on MO](http://math.stackexchange.com/questions/592416/reference-request-trace-integral-formula?noredirect=1#comment1252144_592416). The author seemed to have been somewhat satisfied with the answer given on MO. But the MO question was closed as off-topic and now, deleted. 

If it is not too much trouble, can someone with enough privilege to see [this deleted question here](http://mathoverflow.net/a/150260/3948) either copy the answer over to Math.SE, or perhaps post a copy of the answer below so I can copy it to Math.SE? I would also be grateful if a link to the user who posted the original answer is given so proper credit can be given. 

Thanks