Complex numbers are of the form x+iy, where x and y are real numbers. The complex number z=x+iy can be represented by a point in the Cartesian coordinate plane with abscissa x and ordinate y .Then the x axis is called real axis and the y axis is called the imaginary axis. Every complex number x+iy can be expressed in the form r(cos t +i sin t).This is called the polar form of the complex number.
