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Advanced mathematics questions, solutions, thank you for your answers. I don't understand the last sentence of the answer. How did this causal relationship come about?
Symbols are not easy to type. I use f 1 and f2 instead of the first two third-order derivatives.

The sum of f 1 and f2 is 4. It can be divided into two cases, one is f 1=f2=2, which meets the conditions.

In the second case, if one of f 1 and f2 is greater than 2, and the other is less than 2, then we can get a certain function value of 2 from the intermediate property of continuous function.

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