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Math in Middle Ages_rev, al Tusi 1201-1274 his works contain famous sine formula for plane triangle, famous sine formula for plane triangle is a/sinA=b/sinB=c/sinC, Leonardo Pisano he wrote in 1220, "Practica Geomatriae", Jia Xian 1010-1070 he solve for the first time the scheme which today is named the scheme of Horner, al Samaval 1130-1180 he said "If we decrease a positive nr. from 0, remain the same nr. but negative.", Mathematics in Middle Ages (1000-1500) were from CHINA, CHINA had Jia Xian 1010-1070, Mathematics in Middle Ages (1000-1500) were from ITALY, Fibonacci 1170-1250 is renamed for his famous rabbit's problem, Zhu-Shijie 1270-1330 he given the formulas 1+2+3+...+n=n(n+1)/2 and 1+3+6+...+n(n+1)/2=n(n+1)(n+2)/6