lim x→无穷 x「2+sinx/2x「2-cosx=
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lim x→无穷 x「2+sinx/2x「2-cosx=
lim x→无穷 x「2+sinx/2x「2-cosx=
lim x→无穷 x「2+sinx/2x「2-cosx=
lim(x→∞)(x^2+sinx)/(2x^2-cosx)
=lim(x→∞)(1+sinx/x^2)/(2-cosx/x^2)
lim(x→∞)-1/x^2