A.\(x = \frac{3}{{4\pi }}co{\rm{s}}\left( {\frac{{20\pi }}{3}t + \frac{\pi }{6}} \right)cm\)
B.\(x = \frac{3}{{8\pi }}co{\rm{s}}\left( {\frac{{20\pi }}{3} + \frac{\pi }{6}} \right)cm\)
C.\(x = \frac{3}{{4\pi }}co{\rm{s}}\left( {\frac{{20\pi }}{3}t - \frac{\pi }{6}} \right)cm\)
D.\(x = \frac{3}{{8\pi }}co{\rm{s}}\left( {\frac{{20\pi }}{3} - \frac{\pi }{6}} \right)cm\)
Loga
Hóa Học lớp 12
