A.\(A = \sqrt {{A_1}^2 + {A_2}^2 - 2{A_1}{A_2}\cos \left( {{\varphi _1} - {\varphi _2}} \right)} \).
B.\(A = \sqrt {{A_1}^2 + {A_2}^2 + 2{A_1}{A_2}\cos \left( {{\varphi _1} - {\varphi _2}} \right)} \).
C.\(A = \sqrt {{A_1}^2 + {A_2}^2 + 2{A_1}{A_2}\sin \left( {{\varphi _1} - {\varphi _2}} \right)} \).
D.\(A = \sqrt {{A_1}^2 + {A_2}^2 + 2{A_1}{A_2}\sin \left( {{\varphi _1} - {\varphi _2}} \right)} \).
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Hóa Học lớp 12
