Problem (2): A fenced enclosure consists of a rectangle of length L and semicircle of radius R on the two side of the rectangle as shown in Fig 1. The enclosure is to be built to have an area A of 2600ft2. The cost of the fence is $50 per foot for the curved portion and $40 per foot for the straight sides. Use the fminbnd function to determine the values of R and L required minimizing the total cost of the fence. Also compute the minimum cost