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[" 12."cos2B=(cos(A+C))/(cos(A-C))rArr t...

[" 12."cos2B=(cos(A+C))/(cos(A-C))rArr tan A,tan B,tan C" are in "],[[" A) A.P "," B) H.P "," C) G.P "," D) A.G.P "]]

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