(a). For some values of r, the function f(x) = squareroot x^2 + 1 - x cannot be computed accurately in a computer by using this formula. Explain why and and demonstrate it with an example. Then find a way around the difficulty. (b). Explain why the function f(x) = 1/squareroot x + 2 - squareroot x can not be computed accurately in a computer when x is large (using the above formula). Find a way around the