Which of the following is true for z=(3...

Which of the following is true for `z=(3+2isintheta)(1-2sintheta)w h e r ei=sqrt(-1)` ? (a) z is purely real for `theta=npi+-pi/3,n in Z` (b)z is purely imaginary for `theta=npi+-pi/2,n in Z` (c) z is purely real for `theta=npi,n in Z` (d) none of these

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