A.

Câu hỏi: A.  i=23cos(100πt+π6)(A)

A.  i=23cos(100πt+π6)(A)

B.  i=3cos(100πt-π6)(A)

C.  i=23cos(100πt-π6)(A)

D.  i=3cos(100πt+π6)(A)