Respuesta :
Answer:
cos-1(1.25)
Step-by-step explanation:
cos-1 (also call arccos) is the inverse function of the cosine function. If a cosine is given, cos-1 determine which angle gives that cosine. However, cosine function has a range between -1 and 1, so, it is impossible that a cosine of a given angle is equal to 1.25, and therefore, cos-1(1.25) doesn't exist.
