Now go after .
You still have an in your answer. Notice that
Now adding and subtracting and gives . Now substitute.
This is spin off algebraic query and is wrecking my head.
Given and Adding we get
and subtracting we get (2)
but focusing on (1), I want to find from this...I get
They should equal each other! You have two equations for two unknowns. From your last statement
gives - there's nothing wrong with this.