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Advanced Mathematics 1: Which of the following is correct?
C, of course

The limit of A is 0, and B divides the denominator by X at the same time, so the limit is 1, and C puts X on the denominator. From the first important limit, the limit is 1, so the limit is π/2 when Dx tends to positive infinity, and it is correct when X tends to negative infinity, so the limit does not exist when X tends to infinity.