The problem ask to find the value of the cos(infinity) and the best answer, base on my further calculation and formulation that came up to a solution that leads me to an answer that the cos(infinity) is undefined but it has a range of (-1,1). I hope you are satisfied with my answer and feel free to ask for more
Cosine is an oscillatory function between (1,-1). te value of cosine (infinity)as no value, hence it can not be defined. In other words, it does not either tend to positive or to negative infinity, or converge on any given finite number as a limit
Cosine is the ratio of the adjacent of a right angle triangle over its hypotenuse side.
