Conversion from algebraic form to trigonometric form Y=-5 (Y=5(-1 .) Using the argond shape to represent the real and imaginary part, we will find that Y is located on the negative part of the X axis..and makes an angle of 180 degrees. So the trigonometric image is: π)..Y=5(cosπ+ i sin Note that the Argond shape consists of two axes, the axis corresponding to the X axis ... represents the integers, and the corresponding to the Y represents the imaginary parts of the complex number, and the angle in the trigonometric form is the angle between the standard of the complex number (the root of the sum of squares of the real and imaginary part) and the positive part of the X axis