lim x→无穷 x「2+sinx/2x「2-cosx=
问题描述:
lim x→无穷 x「2+sinx/2x「2-cosx=
答
lim(x→∞)(x^2+sinx)/(2x^2-cosx)
=lim(x→∞)(1+sinx/x^2)/(2-cosx/x^2)
lim(x→∞)-1/x^2