Yes, you are total violating the forum rules.
And you should give him "thanks" for his post, I already gave him reputation...
I quote again and explain the last obvious step
you see what happened here? Just substitute n := n/2 in (1)
And now lets take a closer look to (1):
Do you see the T(n/2)? You know T(n/2), it is '(2)'
Just use (2) in (1)
((2) in (1))
You get it now?