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[" 6.If "cos2B=(cos(A+C))/(cos(A-C))" th...

[" 6.If "cos2B=(cos(A+C))/(cos(A-C))" then Tand,TanB and TanC are in "],[[" 1) "Delta P," 2) "G*P," 3) "H.P," 4) "AC_(i)P]]

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