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[" If "f(x)=(p^(2)-1)/(p^(2)+1)x^(3)-3x+log2" is decreasing function of "x" in "R" .Then set of possible values of "p" (independent of "x" ) is "],[[" (A) "[-1,1]],[" (B) "[1,oo)],[" (C) "(-oo,-1]],[" (D) "[0,oo)]]

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