A.i(t)=8-4e-t(A) B.i(t)=8+4e-t(A) C.i(t)=8-2e-t(A) D.i(t)=8+2e-t(A)
A.Z=R+jL B.Z=R+ωL C.Z=R+jXL
A.4cos314t B.6sin(5t+17°) C.4cos2πt