Use the function f(x) = cos x to generate 11 evenly spaced data points on [0, p]. Find the...

Use the function f(x) = cos x to generate 11 evenly spaced data points on [0, π]. Find the first-degree spline S(x) that interpolates these data points, the actual error |S(x) − f(x)|, and the error bound h^{2}/8.