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f(x)=2x/x^2+1 은 f(x)=2x/(x^2+1) f′(x)=[2(x^2+1)-2x*2x]/(x^2+1)^2 =(2-2x^2)/(x^2+1)^2 u/v 가이드:(u′v-uv′)/v^2
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