求下列函数的富里埃变换:

A . “●”换成“+”，“+”换成“●” B . 原变量换成反变量，反变量换成原变量 C . 变量不变 D . 常数中的“0”换成“1”，“1”换成“0&rdquo

A . 级数求和法 B . 部分分式法 C . 长除法 D . 留数计算法

F(s)e-st0 F(s)est0 无法根据已知条件求出。

<img src='https://img2.soutiyun.com/ask/2020-12-20/977328821805932.png' />

<img src='https://img2.soutiyun.com/ask/2021-01-15/979578362875783.png' />

<img src='https://img2.soutiyun.com/ask/2020-11-11/973943583569769.png' />

<img src='https://img2.soutiyun.com/ask/2021-01-26/980509347169803.png' />

<img src='https://img2.soutiyun.com/ask/2020-07-10/963222964767439.png' />

<img src='https://img2.soutiyun.com/ask/2020-08-21/9668673089213.png' />

<img src='https://img2.soutiyun.com/ask/2020-12-19/977254911036225.png' />

<img src='https://img2.soutiyun.com/ask/2020-07-10/963220534303425.png' />

利用傅里叶变换的移频特性求图3-19所示信号的频谱函数。 <img src='https://img2.soutiyun.com/ask/2020-05-27/959441153469196.png' />

<img src='https://img2.soutiyun.com/ask/2020-08-17/966509686387166.png' />

求下列函数的Laplace逆变换(象原函数);并用另一种方法加以验证. <img src='https://img2.soutiyun.com/ask/2021-01-02/978449366739962.png' />

求下列函数的导数(a∈R): <img src='https://img2.soutiyun.com/ask/2020-10-26/972591573728767.png' />

<img src='https://img2.soutiyun.com/ask/2020-12-16/976966197588706.jpg' /> <img src='https://img2.soutiyun.com/ask/2020-12-16/976966214011646.jpg' />

<img src='https://img2.soutiyun.com/ask/2020-05-27/959444808762267.png' />

<img src='https://img2.soutiyun.com/ask/2020-12-29/978124353573357.png' />

<img src='https://img2.soutiyun.com/ask/2020-09-21/969536909012831.png' />

A．pushMatrix()将当前的视图矩阵压入堆栈，保存坐标系。 B．popMatrix()将视图矩阵弹出堆栈，恢复原先的坐标系。 C．translate(x, y)将原点由(0,0)移动到(x,y)处。 D．rotate(angle)绕原点顺时针旋转。