limx—>无穷(x开三次方)cosx/x+1的极限

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limx—>无穷(x开三次方)cosx/x+1的极限limx—>无穷(x开三次方)cosx/x+1的极限limx—>无穷(x开三次方)cosx/x+1的极限limx—>无穷(x开三次方)cosx/(x

limx—>无穷(x开三次方)cosx/x+1的极限
limx—>无穷(x开三次方)cosx/x+1的极限

limx—>无穷(x开三次方)cosx/x+1的极限
limx—>无穷(x开三次方)cosx/(x+1)
=lim (x开三次方)/(x+1)* cosx
计算lim (x开三次方)/(x+1) 分子分母分别求导 得 lim 1/3*x^(-2/3)=0
又cosx

极限应该为零