Let z_{0} be a root of the quadratic equation, x^{2}+x+1=0. If z=3+6 −3 , then arg Z is equal to
a. 

b. 

c. 
0 
d. 

Let z_{0} be a root of the quadratic equation, x^{2}+x+1=0. If z=3+6 −3 , then arg Z is equal to
a. 

b. 

c. 
0 
d. 

z_{0}= or Where is a nonreal cube root of unity)
z = 3+6i( )^{81}−3i( )^{93}
z=3+3i
arg z=