求极限(x趋向于负0) 2^(1/X)/arctanX
问题描述:
求极限(x趋向于负0) 2^(1/X)/arctanX
答
极限(x趋向于负0) 2^(1/X)/arctanX=极限(x趋向于负0) 2^(1/X)*(-1/x^2)*ln2/(1/(1+x^2))=极限(x趋向于负0) 2^(1/X)*(-(1+x^2)/x^2)*ln2=-ln2*极限(x趋向于负0) 2^(1/X)/x^2=-ln2*lim(t---->-∞)t²/2^(-t)=0...