作者nosignal90 (NoSignal)
看板trans_math
标题[几题]几题请教:)
时间Tue Jun 14 18:36:22 2011
1.
x x
lim (tan -----)^(cos -----)
- 2 2
x→π
我是试着令y=x/2去做,可是之後就解不出来了,囧rz(变成∞?)
2. __
csc (√2x )
∫--------------- dx
__
√x
__ __
my answer is √2 (-ln |csc√2x + cot√2x|) +c
3.
2
1 1/2 -x
∫ ∫ e dxdy
0 y/2
my answer is -e^(-1/4) +1
4. R的范围 (0,1) (1,2) (2,1) (1,0) ,计算
2 2
∫ ∫ (x+y) sin (x-y) dA =?
R
my answer is (26/3)*((1/2)-(1/4)(sin 2))
5. Find the interval of convergence of the power series
∞ (-1)^n (x-2)^n
Σ ----------------- my answer is [1,3]
n= 0 (n+1)^2
先谢谢各位~:)
(每次上来请大家帮我看答案都好紧张喔Q_Q)
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