Mathematical solid geometry is difficult.

Indeed, the vector method is omnipotent. As long as the coordinate system is established, no matter what dihedral angle is calculated or even the proof problem, all formulas can be obtained, which can be said to be "omnipotent".

But the topic is often that vector method is not easy to do, but it is easier to do with traditional methods. The so-called easy here is that it is easy to have ideas, but it is difficult to have no ideas. The traditional way of doing problems is to accumulate, do more and cultivate a three-dimensional sense.

On the other hand, when you can't solve a problem by traditional methods, you'd better build a department decisively ~

If you only build one department for each question, over time, you will rely on this method, and your spatial ability will never improve.

Still use the vector method to guarantee the bottom.