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台灣大學 112 年度 微積分(B)

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100
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12 / 12
主要題型
Applications of differentiation 3Integrals 2Multiple integrals 2The Limit of a Function 1

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PART I. Fill in the blanks.

Each blank is worth 7 points. Only the final clearly labeled answer will be graded.
17The Limit of a Function
Evaluate limx0(x+42tan1(πx))=\lim\limits_{x \to 0} \left(\frac{\sqrt{x + 4} - 2}{\tan^{-1}(\pi x)}\right) = _____(1)_____.
27Derivatives
The curve described by xxy+y=3x - \sqrt{xy} + y = 3 passes through the point (4,1)(4, 1). Find an equation for the tangent line to the curve at (4,1)(4, 1). _____(2)_____.
37Applications of differentiation
The absolute maximum value of the function f(x)=x6e2x2f(x) = x^6 e^{-2x^2} is _____(3)_____.
47Applications of differentiation
The graph of the function g(x)=ln(x3)xg(x) = \frac{\ln(x^3)}{\sqrt{x}} has an inflection point at x=x = _____(4)_____.
57Integrals
Solve for the function ff that satisfies
x4f(t2)lntdt=e(x16)2x16,x>1.\int_{\sqrt{x}}^{4} \frac{f(t^2)}{\ln t}\,dt = e^{(x-16)^2} - \frac{x}{16}, \quad x > 1.
Then f(x)=f(x) = _____(5)_____.
67Applications of integration
The volume generated by rotating the region under the curve y=1x(x+1)y = \frac{1}{\sqrt{x}(\sqrt{x} + 1)} from x=1x = 1 to x=4x = 4 about the xx-axis is _____(6)_____.
77Integrals
Determine if the improper integral 2dxx(x21)3/2\displaystyle\int_2^\infty \frac{dx}{x(x^2 - 1)^{3/2}} is convergent or divergent. Evaluate the improper integral if it is convergent. _____(7)_____.
87Derivatives of multi-variable functions
Find the point on the surface given by x+8y+27z=14\sqrt{x} + \sqrt{8y} + \sqrt{27z} = 14 that is closest to the origin. _____(8)_____.
97Multiple integrals
Evaluate 0204x224x2y22+4x2y2x2+y2+z2dzdydx=\int_0^2 \int_0^{\sqrt{4-x^2}} \int_{2-\sqrt{4-x^2-y^2}}^{2+\sqrt{4-x^2-y^2}} \sqrt{x^2 + y^2 + z^2} \, dz \, dy \, dx = _____(9)_____.
107Differential equations
Solve the initial value problem. xdydx=3x22y\displaystyle x \frac{dy}{dx} = 3x^2 - 2y, y(1)=2y(1) = 2.
y=y = _____(10)_____.

PART II. Show ALL your work and justify your answer.

Each problem is worth 15 points. Only the clearly laid out steps of solving the problem will be graded.
1115Multiple integrals
Evaluate the integral by making an appropriate change of variables.
Rcos[(yxy+x)2]dA\iint_R \cos\left[\left(\frac{y - x}{y + x}\right)^2\right] dA
where RR is the trapezoidal region with vertices (2,0)(2, 0), (3,0)(3, 0), (0,3)(0, 3), and (0,2)(0, 2).
1215Applications of differentiation
Sketch the graph of the function f(x)=x2/3(12x)1/3f(x) = x^{2/3}(12 - x)^{1/3}. Label the following objectives on your graph: (a) Asymptotes (b) Local extrema (points and values) (c) Intervals of increase/decrease (d) Concave up/down intervals.