Problem 6(15%)
Define the Fourier transform of a signal dt, and its inverse Fourier
ransform is
. It is already known that the Fourier transform of signal
x(i)=sin(ai) /(πi) is
and 9
.Compute the Fourier transform of the signal
Problem 5 (15%) Let C be a circle |z|=2 described in the counterclockwise direction.
(b)(10%) Suppose the answer you obtained in Part (a) is jnt . Use Part (a) to evaluate
(a)(5%) Compute the following integral, n is a positive integer
4.如右圖,△ABC
中∠B=90°, =4,
=3
,四邊形
ACFG
和
ABDE
均為正方形,則下列哪些選項是正確的?
(A)
(B)
(C)
(D)△AGE
的面積為12
(E)
在
上之正射影為
3.已知方程組
,令
,
則下列哪些選項是正確的?
(A)若
,則
(B)若c1=c2=0
,則方程組必有解
(C)若△=0
且c1≠0、c2≠0則方程組無解
(D)若△=0
且c1=c2=0,則方程組必有無限多組解
(E)方程組
2.如下圖,已知
,
若
P
為灰色區域內一點(含邊界)
,則下列哪些選項是正確的?
(A)
x≥1
(B)0≤y≤3 (C)若
P 在 E
點,則
x+y=3
(D)若
P
在
,則2x+y=2 (E)若
P
在
,則3x+2y=12