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[" 18.If in a triangle,"a cos^(2)(C)/(2)...

[" 18.If in a triangle,"a cos^(2)(C)/(2)+c cos^(2)(A)/(2)=(3b)/(2)," then its sides will be in "],[[" (A) A.P "," (B) G.P."],[" (C) H.P "," (D) A.G "]]

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