Answer:
1
Step-by-step explanation:
Please see the attached picture for full solution.
☆5th line
Neumerator:
(a +b)²= a² +2ab +b²
Thus, (1 +x)²= 1² +2(1)(x) +x²
Denominator:
(a -b)²= a² -2ab +b²
Thus, (1 -x)²= 1² -2(1)(x) +x²
