I wil appretiate any suggestion of how to demostrate

this equation:

if

then

I could investigate for myself some features and

found some interesting expressions, I list them below:

................(1).

.........(2).

....(3).

a mean they are all equal (1)=(2)=(3).

and if then

(4)...... .........see exppretion 2.

(5)...... .........It is well known that .

I hope these ecuations above help.