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[" Let "a in R" and "let f:R rarr R" be given by "],[qquad f(x)=x^(5)-5x+a],[" Then "],[[" (A) "f(x)" has three real roots if "a>4],[" (B) "f(x)" has only one real roots if "a>4],[" (C) "f(x)" has three real roots if "a<-4],[" (D) "f(x)" has three real roots if "-44" or "a<-4]]

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