Let z=x+iy be a complex number the argument of the complex number is denoted and defined as

Arg z=tan

it has infinite values but we need an angle which has unique value between -180 and 180 of theta which is called principle argument of complex number and is denoted by arg z. It has unique value.

www.numbertheory.org

Arg z=tan

^{-1}y/z= thetait has infinite values but we need an angle which has unique value between -180 and 180 of theta which is called principle argument of complex number and is denoted by arg z. It has unique value.

www.numbertheory.org