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Problem solving in advanced mathematics
B and c are both functions of x, so the derivative is not always zero.

D in the process of integration, x is a constant and t is a variable, so the result of integration is (a-b)xf(x), and the derivative is not necessarily zero.

It should be a, the result of definite integral in a is constant, and the result of BCD integral is a function of X.

Look at the difference between a and d, and it will be easy to choose.