作函数图像：

y=x^2;sqrt(1-x^2);

作函数图像：

y=-arctan（2x+1）+1

作函数图像：

y=xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx;xcosxx;xsinx

作函数图像：

y=x2≤1;;

作函数图像：

y=ln(1-x*x);