Because we have two points, we can draw the entire function q 1 ″ ( q 2 ) {\displaystyle q_{1}''(q_{2})} , see diagram 3.
这是因为有两点，我们能画出函数 q 1 ″ ( q 2 ) {\displaystyle q_{1}''(q_{2})} 的整个图像，见图3。