A.\(\left| {{\varphi _1} + {\varphi _2}} \right|\).
B.\(\left| {\dfrac{{{\varphi _1} + {\varphi _2}}}{2}} \right|\).
C.\(\left| {\dfrac{{{\varphi _1} - {\varphi _2}}}{2}} \right|\).
D.\(\left| {{\varphi _1} - {\varphi _2}} \right|\).
Loga
Hóa Học lớp 12
