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[" 8.Prove that "cos^(2)A+cos^(2)(A+(2 p...

[" 8.Prove that "cos^(2)A+cos^(2)(A+(2 pi)/(3))+cos^(2)(A-(2 pi)/(3))=(3)/(2)],[" 9.Solve : sec "x-tan x=sqrt(3)]

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