- A=2|A1−A2|A = 2\left|A_{1} - A_{2} \right|
- A=2|A1+A2|A = 2\left|A_{1} + A_{2} \right|
- A=|A1−A2|A = |A_{1} - A_{2}|
- A=A1+A2A = A_{1} + A_{2}