[" If "(cos theta+i sin theta)(cos2 thet...

[" If "(cos theta+i sin theta)(cos2 theta+i sin2 theta)..............." (cos "n theta+i sin n theta)=1" then the value of "theta" is "],[[" (a) "4m pi," (b) "(2m pi)/(n(n+1))," (c) "(4m pi)/(n(n+1))," (d) "(m pi)/(n(n+1))]]

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