Tonight I go to the main library to study.
When I practice do the exercises in section 39,
I find that some theorems there can be applied to solve the problemswe have ever done in senior high.
Which require us to find the tangent plane at one point in 3-dimensional space.
I am so exciting because I know the application and there is another way to solve this kind of problem.
Sometimes I think Advanced Calculus is useful and interesting but it is always difficult,
and we have to take a lot of time to study it.
Advanced Calculus is the subject which I like most and is the only one I really learn.
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