The Gateway Arch in St. Louis has the shape of an inverted catenary. Rising 630 feet at its center and stretching 630 feet across its base, the shape of the arch can be approximated by:

y= -127.7 cosh ( x/127.7) + 757.7 for -315< x < 315

Write Matlab commands to SUFFICIENTLY PLOT the shape of the arch by using the above equation.