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 February 6th, 2019, 02:29 AM #1 Member   Joined: Feb 2018 From: Iran Posts: 30 Thanks: 3 Range of function For which value of a does the interval [0,1/3] completely include the range of the function: f(x)=1/(3x^(4)âˆ’8ax^(3)+12a^(2)+x^(2)+a)
 February 6th, 2019, 01:25 PM #2 Global Moderator   Joined: May 2007 Posts: 6,684 Thanks: 659 It is easier to analyze by $3x^4-8ax^3+12a^2+x^2+a \ge3$ Thanks from idontknow

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