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If a=costheta+isintheta,b=cos2theta-isin...

If `a=costheta+isintheta,b=cos2theta-isin2theta,c=cos3theta+i sin3theta` and if `|[a,b,c],[b,c,a],[c,a,b]|=0` then a.`theta=2kpi, k in Z` b. `theta=(2k+1)pi, k in Z` c. `theta=(4k+1)pi, k in Z` d. none of these

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