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Let f be a biquadratic function of x giv...

Let f be a biquadratic function of x given by `f(x) = Ax^4+Bx^3+Cx^2+Dx+E,where A,B,C,D,E in Rand 4!=0. If lim_(x->oo)(f(-x)/(2x^3))^(1/x)=e^-3`, then

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