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[(sin3 theta)/(2cos2 theta+1)=(1)/(2)" i...

[(sin3 theta)/(2cos2 theta+1)=(1)/(2)" if "],[[" (A) "theta=n pi+(pi)/(6)," (B) "theta=2n pi-(pi)/(6)],[" (C) "theta=n pi+(-1)^(n)(pi)/(6)," (D) "theta=n pi-(pi)/(6)]]

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