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meerkat18
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 
Cetacea

Any value between -1 to 1. The value will oscillate.

We know that the values of cos is always between -1 to 1.

Infinity is not a fixed number. So as the value of infinity changes then the value of cos will also change, but will stay between -1 to 1.

Find out more information about the cosine here: https://brainly.com/question/17075439