Answer these in Matlab

1. Create the symbolic variables a bc d x and use them to create the following symbolic expressions: se1 = x^3-3*x^2 +x se2 = sin (x) + tan (x) se4 (x"2-9) / (x+3) (a) Divide sel by se2 (b) Multiply se3 by se4 (c) Divide sel by x. (d) Add sel to se3 2. A pendulum is a rigid object suspended from a frictionless pivot point. If the pendulum is allowed to swing back and forth with a given inertia, we can find the frequency of oscillation with the equation where f= frequency m = g = acceleration due to gravity L-distance from the pivot point to the center of gravity of mass of the pendulum the pendulum, and 1= inertia Use MATLABs symbolic capability to solve for the length L 3. Let the mass, inertia, and frequency of the pendulum in the previous prob- lem be, respectively m = 10 kg f = 0.2 s-1 1 = 60 kg m/s. If the pendulum is on the earth (g = 9.8 m/s2) what is the length fromthe pivot point to the center of gravity? (Use the subs function to solve this problem.)