a. Plot the following functions using MATLAB y=a* Sin (x+b) Plot three different lines on the same plot by assuming 1. a=b=0.125 and x(0,10) 2. a=b=0.375 and x(0,10) 3. a=b=0.5 and x(0,10) b. The initial heat distribution over a steel plate is given by the function u(x, y) = 80y2el-x2-0.3y2) -2.1sx52.1; -6 sy s6 plot the surface u over the given range