Consider the signal s = [ 1 4 6 7 -2 3]
A. Determine the least-squares approximation s^ of based on v(1), v(2), and v(5).
B. Compute the squared approximation error ||s^ - s||^2.
C. Show that s^ = s when v(0), v(1), v(2), v(3), v(4), and v(5) are used.