求lim n→∞(cos^2θ/n)^n^/2这是解题步骤,这是不明白的地方,这里是因为啥啊? 求大神告知,感激不尽!

lim(n→∞) (cos x/n)^n^2 如何求 lim(n→∞)cos(x/2)cos(x/4)...cos(x/2n) 求lim n→∞ (1+2/n)^n+3 lim n→∞ n^(3/2)* (n+1)^(1/2)* (1-cos(π/n))=? 求lim(n→∞) ln(n!)/ln(n^n) 求极限lim [ 2^(n+1)+3^(n+1)]/2^n+3^n (n→∞) 求极限lim(x→∞)（1/n+2/n+3/n..+n/n） 用夹逼定理求lim(n→∞)[√(n^2+n)-n]^(1/n) 求极限lim(n→∞)(1/n²+2/n²+...+n/n²) 用夹逼定理求lim(n→∞)√[(n^2+n)-n]^(1/n) 求lim n→+∞(1/n^k+2/n^k+ +n/n^k)有三种情况, lim n →∞ (1^n+3^n+2^n)^1/n,求数列极限 求当n趋向于无穷时,lim[cos(θ/n)])^n)^n=? 求极限lim n→∞(1/(n+1)+1/(n+2)+.+1/(n+n) 求极限(1/(n+1)+1/(n+2)+.+1/(n+n) 求lim(n→∞)(3n^3+2n^2+1)/(2n^2+3) 求极限lim(n→∞)(3n^2-n+1)/(2+n^2)? 求极限lim(-2)^n+3^n/(-2)^[n+1]+3^[n+1] (x→∞) lim（1/n+2^1/n）^n n→∞求详解!高数极限