Respuesta :
cos (Ф) = 5/12
arcos (5/12) = cos⁻¹ (5/12) = Ф
Then cos⁻¹ (5/12) = 57.769 and Ф = 58
arcos (5/12) = cos⁻¹ (5/12) = Ф
Then cos⁻¹ (5/12) = 57.769 and Ф = 58