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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 "],[cos x+cos2x+cos3x+cos4x=0," is "],[[" (1) "5," (1) "5," (- "2)7," (3) "9]," [JEE(Main) "2016,(4,-1),12]

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