In one of my textbook example, after the summation result was given, they simplified the expression but I can't see how this simplification was done.
I don't see how the LHS simplified to the RHS? All help will be appreciated. Thanks in advance.
In one of my textbook example, after the summation result was given, they simplified the expression but I can't see how this simplification was done.
I don't see how the LHS simplified to the RHS? All help will be appreciated. Thanks in advance.