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Math in Middle Ages, al Tusi 1201-1274 his work containe the famous sine formula for plane triangle, containe the famous sine formula for plane triangle which is a/sinA=b/sinB=c/sinC, 1000-1500 China Zhu-Shijie 1270-1330, Leonardo Pisano he wrote in 1220, "Practica Geomatriae", 1000-1500 Iran Omar Khayyam 1048-1131, Jia Xian 1010-1070 he solve for the first time the scheme which today is named yhe scheme of Horner, al Samaval 1130-1180 he said "If we decrease a positive nr. from 0, remain the same nr. but negative.", Fibonnaci 1170-1250 is renomed for his famous rabit'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, 1000-1500 Iran al Tusi 1201-1274