作函数图像：

y=xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
y=xcosxx
y=xsinx

作函数图像：

y=ln(1+x)

作函数图像：

y=y
y=根号下2x

作函数图像：

y=3的x次方

作函数图像：

y=arctan1/x-1