答案为2
lim(x趋于无穷)(2lnx-1)/(lnx+1)≤lim(x趋于无穷) (2lnx+sinx)/(lnx+cosx)≤lim(x趋于无穷)(2lnx+1)/(lnx-1)
lim(x趋于无穷)(2lnx-1)/(lnx+1)=lim(x趋于无穷)(2lnx+1)/(lnx-1)=2
根据夹逼定理 得原式=2
答案为2
lim(x趋于无穷)(2lnx-1)/(lnx+1)≤lim(x趋于无穷) (2lnx+sinx)/(lnx+cosx)≤lim(x趋于无穷)(2lnx+1)/(lnx-1)
lim(x趋于无穷)(2lnx-1)/(lnx+1)=lim(x趋于无穷)(2lnx+1)/(lnx-1)=2
根据夹逼定理 得原式=2