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[" If "cos2B=(cos(A+C))/(cos(A-C))," the...

[" If "cos2B=(cos(A+C))/(cos(A-C))," then "tan A,tan B,tan C" are "],[" in "],[[" (a) A.P."," (b) G.P."],[" (c) H.P."," (d) None of these "]]

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