I think it is more difficult to do geometry simply with geometry knowledge. It will be very simple to combine solid geometry with the vector of compulsory 4.

But compulsory 2 also involves analytic geometry (circle and straight line), which is one of the difficulties in the college entrance examination. Every year, there is a particularly difficult problem in the national examination paper to analyze geometry.

As for compulsory 4. . Trigonometric function can be said to be a relatively simple question in the college entrance examination.