Between two telephone poles that are 44 feet apart, there is

Last updated: 7/19/2022

Between two telephone poles that are 44 feet apart, there is a wire suspended in the shape of a catenary y = 15 cosh (x/15) - 8, where x and y are measured in feet and -22 ≤ x ≤ 22. What is the slope of the curve where the wire meets the left pole?