本课件是在《几何画板》环境中制作的，用鼠标点击按钮就可动态地显示正弦曲线y＝sinx向正弦型曲线y＝Asin（bx＋c）的变化过程。一、单项变化第一步，进入《几何画板》工作界面，建立平面直角坐标系，调整单位长度。第二步，在X轴上任取一点R，分离出这点的横坐标XR，然后计算 This courseware is produced in the “Geometric Sketchpad” environment. With the mouse click of a button, the sinusoidal y=sinx sinusoidal curve y=Asin(bx+c) can be dynamically displayed. First, single change The first step, enter the “geometric drawing board” interface, establish a plane rectangular coordinate system, adjust the unit length. In the second step, take a point R on the X-axis and separate the abscissa XR of this point, then calculate