trygonometria

trygonometria 1231: sin70=a ile to cos140

11 mar 20:56

Basia: cos140 = cos(2*70) = cos²70 − sin²70 = 1−sin²70−sin²70 = 1−2sin²70 = 1−a²

11 mar 20:57

1231: dzieki

11 mar 21:02