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Let f (x) = −x^4− 4x^3. (i) Find the intervals of increase/decrease of f . (ii)...

Let f (x) = −x^4− 4x^3. (i) Find the intervals of increase/decrease of f . (ii) Find the local extrema of f (values and locations). (iii) Determine the intervals of concavity. (iv) Find the location of the inflection points of f. (v) Sketch the graph of f
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