Exer.: (a) Sketch the graph of f on the given interval [a, b]. (b) Estimate the range of f on [a, b]. (c) Estimate the intervals on which f is increasing or is decreasing.
f(x)= x4 −0.4x3 − 0.8x2 + 0.2x + 0.1; [−1, 1]
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