lim[n⼀(n^2+1^2)+n⼀(n2+2^2)+···n⼀(n^2+n^2)] n->无穷大

2024-11-19 17:31:01
推荐回答(1个)
回答1:

n/(n^2+i^2) = (1/n)/(1+(i/n)^2)
所以原式 = ∫(0,1) 1/(1+x^2)dx = arctanx|(0,1)=π/4