lim(n->∞)[√(1+cosπ/n)+√(1+cos2π/n)+……+√(1+cosnπ/n)]*1/n=
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lim(n->∞)[√(1+cosπ/n)+√(1+cos2π/n)+……+√(1+cosnπ/n)]*1/n=lim(n->∞)[√(1+cosπ/n)+√(1+cos2π/n)+……+√(1+co
lim(n->∞)[√(1+cosπ/n)+√(1+cos2π/n)+……+√(1+cosnπ/n)]*1/n=
lim(n->∞)[√(1+cosπ/n)+√(1+cos2π/n)+……+√(1+cosnπ/n)]*1/n=
lim(n->∞)[√(1+cosπ/n)+√(1+cos2π/n)+……+√(1+cosnπ/n)]*1/n=
转化为积分
=∫(从0至1) √(1+cosπx) dx
=∫(从0至1) √[cos²(πx/2)] dx
=∫(从0至1) |cos(πx/2)| dx
=∫(从0至1) cos(πx/2) dx
= (2/π) ∫(从0至1) cos(πx/2) d(πx/2)
= (2/π) sin(πx/2) |(从0至1)
= (2/π) [sin(π/2) - sin(0)]
= 2/π
lim n→∞ n^(3/2)* (n+1)^(1/2)* (1-cos(π/n))=?
lim(1-cosπ/n)n趋于无穷大的极限,
lim(n->∞)[√(1+cosπ/n)+√(1+cos2π/n)+……+√(1+cosnπ/n)]*1/n=
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求极限 lim(n→∞) tan^n (π/4 + 2/n) lim(n→∞)tan^n(π/4+2/n) =lim(n→∞)[(tan(π/4)+tan(2/n))/(1-tan(π/4)tan(2/n))]^n =lim(n→∞)[(1+tan(2/n))/(1-tan(2/n))]^n =lim(n→∞)(1+tan(2/n))^n/(1-tan(2/n))^n (1) 因为 lim(n→∞)(1+tan(2/n)