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[" 92.If "0<=x<2 pi" ,then the number of...

[" 92.If "0<=x<2 pi" ,then the number of real values of "x" ,"],[" which satisty the equation "],[[cos x+cos2x+cos3x+cos4x,=0," is "],[[" (1) "5," (2) "7]]]

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