Jawabanmu

2014-05-01T22:12:59+07:00
(Sin 90 + Sin 180) + (Sin 91 + Sin 269) + (Sin 92 + Sin 268) + ...+ (Sin 179 + Sin 181)
Sin 90' + Sin 180' = 1 + 0 = 1
Sin 91' + Sin 269' = 2Sin180'Cos178' =2(0)Cos178' = 0
Sin 92' + Sin 268' = 2Sin180'Cos176' =2(0)Cos176' = 0 dst sampai
Sin179' + Sin 181' = 2Sin180'Cos1' = 2(0)Cos1' = 0
Jadi, nilai dari Sin 90' + Sin 91' + Sin 92' +...+ Sin 269' =.1