Question

whats arg(z)?

Answer 1

the angle made by the complex no's line with the x-axis

Answer 2

it is the angle that the complex no. makes with the positive dir of x-axis when the angle is between 0 and 180 degrees when it is between 180 and 360 degrees it is the angle that the c.n. makes with negative dir of x-axis....the angles measured in anticlockwise dir are taken to be positive and that measured in an clockwise dir are taken to be negative