作函数图像：

y=;2xxxxxxxx;

作函数图像：

y=（cos1/x）2

作函数图像：

y=lg100x;;

作函数图像：

y=xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx;xcosxx;xsinx

作函数图像：

y=xcosx66
y=xsin4