#### Priciple

With goes down to those hard problems, I want to let you know a priciple that we use in general math problem:

> We always split hard problem to multiple easy problems or step by step simplify hard problem.

In computer science, we named it `Divide & Conquer` (`D&C algorithms`)

#### Simple one

Let's try to analyze this equation:

We knew that
of
is the original function, so do
. Because two of them in a same original function, when
becomes
,
have to times
.

As for
, it must interact with
, then it becomes original function.

You can see
as a whole thing. you also can extract a constant from it, we will talk about it later.

#### Complex one

#### Conclusion

1. Keep equation balance

2. Best way to deal with
   is to replace it with a symbol

3. Molecular is a constant is more convenient for us to solve equation, especially when it is
   (for example: extract a constant out, and put it in front of
   )

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