求极限lim x→∞ (xsin1/x+sinx/x+cosx/x)
问题描述:
求极限lim x→∞ (xsin1/x+sinx/x+cosx/x)
答
lim(x→∞)(xsin1/x + sinx/x + cosx/x)
=lim(x→∞)[ (sin1/x)/(1/x) +(1/x)sinx + (1/x)cosx ]
重要极限无穷小量*有界量
= 1 + 0 + 0
= 1