作函数图像：

y=xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx;xcosxx;xsinx

作函数图像：

y=xcosx66
y=xsin4

作函数图像：

y=(sin2x+2)

作函数图像：

y=2sin（x/2+π/3）+1

作函数图像：

y=lnx+sinx