[" If "f(x)=x^(3)-6x^(2)+9x+3" be a decr...

[" If "f(x)=x^(3)-6x^(2)+9x+3" be a decreasing "],[" function,then "x" lies in "],[" (A) "(-oo,-1)nn(3,oo)],[" (B) "(1,3)],[" (C) "(3,oo)],[" (D) "(1,4)]

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