π ≒ 22/7    (約率)

7π/2 = 11 - 0.0044257124

nが奇数のとき
 |sin(11n)| > 1 - (1/2)(0.0044257124 n)^2 = 1 - 0.0000098nn,

nが偶数のとき
 |sin(11n)| < 0.0044257124 n,

 (分かスレ454-178,188)