K
kid_and_angel


(sin^3)x+(sin^3)2x+(sin^3)3x=(sinx+sin2x+sin3x)^3
moi nguoi giai ho minh ha. minh cam thay kho wa'.
thank nhieu nhieu ha!
moi nguoi giai ho minh ha. minh cam thay kho wa'.
thank nhieu nhieu ha!