I have a problem in the calcellation of two expressions
which are visibly equal. The numerators are exactly the same while the denominator are the same but written in a different way and mathematica is not able to cancel them even using the option FullSimplify. I have already tried to use the command Expand and ExpandAll and then FullSimplify but nothing change. I attach the explicit example for a better understanding of the problem
Notice that when t=0, they are not always equal.