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成功大學 98 年度 微積分

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題數
10
總分
100
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0 / 10

微積分 其他年度考古題

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110
Show that
limnk=0n1n2k2n2=π4\lim\limits_{n \to \infty} \sum\limits_{k=0}^{n-1} \frac{\sqrt{n^2 - k^2}}{n^2} = \frac{\pi}{4}
(Hint: Riemann sum)
210
Let f(x)=xxf(x) = x^x, x>0x > 0
(a)5
Calculate f(x)f'(x)
(b)5
Find limx0+f(x)\lim\limits_{x \to 0^+} f(x)
310
Find xx21dx\displaystyle \int \frac{\sqrt{x}}{x^2 - 1} dx \quad (Hint: x=u2x = u^2)
410
Find cos(lnx)dx\int \cos(\ln x) dx\quad (Hint: integration by parts twice)
510
Find limn(enn2nex2dx)\lim\limits_{n \to \infty} \left( e^n \int_n^{2n} e^{-x^2} dx \right) \quad (Hint: pinching or sandwich theorem)
610
Find the radius of convergence of the power series
3k(k!)3(3k)!xk\sum \frac{3^k(k!)^3}{(3k)!} x^k
710
Use the method of Lagrange multiplier to find the extreme values of f(x,y)=xy3f(x,y) = xy^3 subject to the side condition x2+3y2=16x^2 + 3y^2 = 16.
810
Find the area of the surface by revolving the cycloid
x(t)=tsint,y(t)=1cost,0t2πx(t) = t - \sin t,\quad y(t) = 1 - \cos t, \quad 0 \leq t \leq 2\pi
about the xx-axis.
910
Let
g(x,y)={x2y2x4+y4,(x,y)(0,0)0,(x,y)=(0,0)g(x,y) = \begin{cases} \displaystyle\frac{x^2y^2}{x^4 + y^4}, & (x,y) \neq (0,0) \\ 0, & (x,y) = (0,0) \end{cases}
Show that limx(0,0)f(x,y)\lim\limits_{x \to (0,0)} f(x,y) does not exist.
1010
Use polar coordinates to compute
1211xx1x2+y2dydx.\int_\frac{1}{2}^1 \int_{{1-x}}^{x} \frac{1}{\sqrt{x^2 + y^2}} dy dx.
(Hint: cosθ+sinθ=2sin(θ+π4)\cos \theta + \sin \theta = \sqrt{2}\sin(\theta + \frac{\pi}{4}))