A.\({u_M} = 4co{\rm{s}}\left( {10\pi t - \frac{\pi }{2}} \right)\left( {cm} \right)\)
B.\({u_M} = 4co{\rm{s}}\left( {10\pi t + \frac{\pi }{4}} \right)\left( {cm} \right)\)
C.\({u_M} = 4co{\rm{s}}\left( {10\pi t + \frac{\pi }{2}} \right)\left( {cm} \right)\)
D.\({u_M} = 4co{\rm{s}}\left( {10\pi t - \frac{\pi }{4}} \right)\left( {cm} \right)\)
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Hóa Học lớp 12
