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[" 34.If "x tan^(2)120^(@)+4cos^(2)150^(...

[" 34.If "x tan^(2)120^(@)+4cos^(2)150^(@)=9" then "x=],[[" 1) "3," 2) "1],[" 3) "2," 4) "4],[" tanded at "C" ,then "]]

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