[" If "tan theta+tan4 theta+tan7 theta=t...

[" If "tan theta+tan4 theta+tan7 theta=tan theta tan4 theta tan7 theta," then "theta=],[[" (1) "(n pi)/(4),n in I," (2) "(n pi)/(7),n in I],[" (3) "(n pi)/(12);n!=6(2k+1),(n,k in I)," (4) "n pi,n in I]]

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