X趋于∞时lim√(x²+1)-√(x²-1)=?
问题描述:
X趋于∞时lim√(x²+1)-√(x²-1)=?
答
lim[√(x²+1)-√(x²-1)]
=lim[(x²+1)-(x²-1)]/[√(x²+1)+√(x²-1)]
=lim2/[√(x²+1)+√(x²-1)]
=0