21. Consider the function f(x)=x3+1x3−4x.
(1) Find the domain, the x - and y-intercepts,
(2) Find the asymptotes,
(3) Find the intervals of increase and decrease.
(Tip: The root for 8x3+3x2−4=0 is x≈0.68636.)
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\end{tabular} Part V Evaluate the following integral. (5 scores per question. The total is 10 scores.) 17. ∫12(x3)dx.