设∫f(x)dx=2sin(x/2)+C，则f(x)=()
设∫f(x)dx=2sin(x/2)+C，则f(x)=()
A、sin(x/2)
B、cos(x/2)
C、(1/2)sin(x/2)
D、(1/2)cos(x/2)
【正确答案】：B
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