An electrical cable is hung over two gantries at a height of y a distance of L metres apart. The cable forms the shape of a catenary of the form y = c cosh (x/c) where x = L/2. You have been asked to...

 An electrical cable is hung over two gantries at a height of y a distance of L metres apart. The cable forms the shape of a catenary of the form y = c cosh (x/c) where x = L/2. You have been asked to determine the fixing point height (y) if the minimum clearance (c) is to be 3m at the centre of the catenary given you own length of 2.3metres