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

[" If "0<=x<2 pi" ,then the number of real values of "x,],[" which satisfy the equation "],[qquad cos x+cos2x+cos3x+cos4x=0" ,is "],[[" (a) "3," (b) "5," (c) "7," (d) "9]]

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