当n趋近于无穷时n^2(1-cos(π/n))

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当n趋近于无穷时n^2(1-cos(π/n))当n趋近于无穷时n^2(1-cos(π/n))当n趋近于无穷时n^2(1-cos(π/n))limn^2(1-cos(π/n))=limn^2(2sin^

当n趋近于无穷时n^2(1-cos(π/n))
当n趋近于无穷时n^2(1-cos(π/n))

当n趋近于无穷时n^2(1-cos(π/n))
lim n^2(1-cos(π/n))
=lim n^2(2sin^(π/2n)
=lim n^2*2(π/2n)^2
=π^2/2