The argument of the complex number    is

Concept:

The argument of z is the angle between the positive real axis and the line joining the point to the origin.

if a complex function is given by, z = x +iy, then the argument of z = arg(z) = 

 Calculations: 

Given, the complex number 

⇒  = x + iy

By comparing,

⇒ x = 0 and y = 1

⇒ z lies in the first quadrant.

Hence, arg(z) = 

⇒arg(z) = 

⇒ arg(z) =  

Hence, the argument of the complex number   is