Imaginary Number If a one-dimensional vector rotates +90 degrees and rotates +90 degrees once more, the result can be -1.Complex Number x + j y " data-ke-type="html">HTML 삽입미리보기할 수 없는 소스 If a number is not expressed as a single number such as 1, 2, or 3 but as a field composed of several units, it is called a complex number, x is ..