所屬科目:研究所、轉學考(插大)-微積分
1. Find the limit:Answer: _________
2. Find the smallest positive (x > 0) infection point of F(x) = dt. Answer :____________
3. How many local extreme values does the function have? Answer :___________
5. Evaluate dA where R is the unit disk x2+ y2 ≤1. Answer :__________________
7. Calculate dA where R is the interior of the ellipseAnswer : ___________
8. Find the area of the region enclosed by the limagon x= 2 cost- cos2t, y=2sint-sin2t, 0≤t≤2m Answer :__________
1. LetUse polar coordinates to show that f(x, y) is continuous at all (z, y) ifp ≤ 2, but discontin- uous at (0,0) if p ≤ 2.
b. Show that if an converges,then converges. (6 points)
3. Goods I and 2 are available at prices (in dollars) of p1 per unit of good 1 and p2 per unit of good 2. A utility function U(x1, x2) is a function representing the utility or beneit fo consuming xj, units of good j. The marginal utility of the jth good is , the rate of increase in utility per unit increase in the jth good. Prove the following law of economics: Given a budget of L dollars, utility is maximized at the consumption level (a,b) where the ratio of marginal utility is equal to the ratio of prices: