特征值
正交矩阵
对角化矩阵
[0, 0, 9]
[[−0.0778, 0.9396, 0.3333]
[−0.7241, 0.1766, −0.6667]
[−0.6853, −0.2932, 0.6667]]
[[0, 0, 0]
[0, 0, 0]
[0, 0, 9]]