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題組內容

4. (20%)

(a) (10%) Verify that the region below the graph of f(x) = 1/x, x≥1 has infinite area.

其他申論題

(b) (10%) Let g be a function defined at least on some open interval containing the number 0. We say that g is of smaller order than h, or that g(h) is little-o(h) and write g(h) = o(h), if and only if g(h) is small enough compared with h that = 0. Show that h3 = o(h).

2. (15%) Show that ln(1+x) ≈ x as x→0. (Hint: (ln(x))'=1/x)

(a) (10%) Find the critical numbers of F and determine theintervals on which F is increasing and the intervals onwhich F is decreasing.

(b) (10%) Determine the concavity of the graph of F and find thepoints of inflection (if any).

(b) (10%) Suppose that the region (a) is revolved about the x-axis, what is the volume of the resulting solid ?

(a) (5%) At the point (1,-2), in what direction does the voltage increase most rapidly ?

(b) (5%) In what direction does the voltage decrease mostrapidly ?

(c) (5%) What is the magnitude of this increase or decrease ?

(d) (10%) Describe the path of a particle that starts at the point (1,-2) and moves in the direction of greatest voltage increase.

1. 求下列各極限:(1)=________

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