6.4 Determine the lowest positive root of f(x) = 7 sin(x)e¯*- 1: (a) Graphically. (b) Using the Newton-Raphson method (three iterations, x0 = 0.3). (c) Using the secant method (three iterations, x1 = 0.5 and x = 0.4. (d) Using the modified secant method (five iterations, x0 = 0.3, 8 = 0.01).