It doesn’t matter (8,4) 8=x1 , 4=y1 (-4,-4) -4=x2 , -4=y2
For starters,

Consider the
th partial sum, denoted by
:

Multiply both sides by
:

Subtract
from this:

Solve for
:


Now as
, the exponential term will converge to 0, since
if
. This leaves us with
