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[" Let "f(x)=int(0)^(x){(a-1)(t^(2)+t+1)...

[" Let "f(x)=int_(0)^(x){(a-1)(t^(2)+t+1)^(2)-(a+1)(t^(4)+t^(2)+1)}dt," then the value of a lie in the interval for which "f'(x)=0" has two "],[" distinct real roots is "],[[" (A) "(-2,2),(B)(-oo,-2)uu(2,oo),(C)(-4,4)," (D) no such a exist "]]

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