单项选择题


A、diff(5*x/(1+x^2)),diff(5*x/(1+x^2),5)
B、syms x;diff(5*x/(1+x^2)),diff(5*x/(1+x^2),5)
C、syms x;diff(5x/(1+x^2)),diff(5*x/(1+x^2),5)
D、syms t;diff(5x/(1+x^2)),diff(5x/(1+x^2),5)

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