The complex number z=18+18iz = 18 + 18iz=18+18i has argument theta\\thetatheta. What is theta\\thetatheta?
dfracpi6\\dfrac{\\pi}{6}dfracpi6
dfracpi3\\dfrac{\\pi}{3}dfracpi3
dfracpi4\\dfrac{\\pi}{4}dfracpi4
dfracpi2\\dfrac{\\pi}{2}dfracpi2