作函数图像：

y=;;;cosx

作函数图像：

y=log3x

作函数图像：

y=x/(arctanx)

作函数图像：

y=xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx;xcosxx;xsinx

作函数图像：

y=x^4+1.5x+x^-1