Mathematica(@mathemetica):On this day, May 19 1681, Chinese mathematician and writer Mei Juecheng was born. He published Chishui yizhen (Pearls Recovered from the Red River), which included the infinite series expansion for sin(x), introduced to China via Jesuit missionaries. sin x = x − x³/3! + x⁵/5! − x⁷/7! + ⋯ (Originally from Gregory & Newton, introduced to China ~1701 as “Du Demei’s formula”)

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Mathematica@mathemetica

2026.05.19 04:55

On this day, May 19 1681, Chinese mathematician and writer Mei Juecheng was born. He published Chishui yizhen (Pearls Recovered from the Red River), which included the infinite series expansion for sin(x), introduced to China via Jesuit missionaries. sin x = x − x³/3! + x⁵/5! − x⁷/7! + ⋯ (Originally from Gregory & Newton, introduced to China ~1701 as “Du Demei’s formula”)