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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 satisfy the equation "],[cos x+cos2x+cos3x+cos4x=0" ,is "],[[" (1) "5," (2) "7],[" (3) "9," (4) "3],[" 93.A man is walking towards a vertical pillar in a "]]

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