∫f′(x)/1+[f(x)]2dx=()
∫f′(x)/1+[f(x)]2dx=()
A、ln|1+f(x)|+C
B、(1/2)arctanf(x)+C
C、(1/2)1n[1+f2(x)]+C
D、arctanf(x)+C
【正确答案】:D
【题目解析】:∫f′(x)/[1+f2(x)]dx=∫df(x)/[1+f2(x)]=arctanf(x)+C,故选D
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