Using complex(), a sequence of complex numbers can be created in two ways, either by entering the real and imaginary parts of a complex number, such as A3, or by using a paired sequence, such as A5.

A3 Create a complex sequence with A1 as the real part and A2 as the imaginary part

A5 Create a complex sequence by using the paired sequence A4. For the convenience, entering A4 directly in most other complex functions can be automatically converted to complex number without using complex().