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