Use the method of Steepest Descent with TOL = 0.05 to approximate the solutions of the following nonlinear systems. a. 15x1 + x2 2 − 4x3 = 13, x2 1 + 10x2 − x3 = 11, x3 2 − 25x3 = −22. b. 10x1 − 2x2 2 + x2 − 2x3 − 5 = 0, 8x2 2 + 4x2 3 − 9 = 0, 8x2x3 + 4 = 0. c. x3 1 + x2 1x2 − x1x3 + 6 = 0, ex1 + ex2 − x3 = 0, x2 2 − 2x1x3 = 4. d. x1 + cos(x1x2x3) − 1 = 0, (1 − x1)1/4 + x2 + 0.05x2 3 − 0.15x3 − 1 = 0, −x2 1 − 0.1x2 2 + 0.01x2 + x3 − 1 = 0.