Replying to Avatar Greg Egan

∑ᵢ₌₀ⁿ⁻²∑ⱼ₌ᵢ₊₁ⁿ⁻¹𝑠𝑖𝑛((𝑗−𝑖)π/𝑛)⁴=3𝑛²/16

Well, obviously.
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Raymon 4mo ago

👀

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