How to I code the solution in Mathematica using NDsolve? (I do not have access to MATLAB)

1.50 [Computer] The differential equation (1.51) for the skateboard of Example 1.2 cannot be solved in terms of elementary functions, but is easily solved numerically. (a) If you have access to software, such as Mathematica, Maple, or Matlab, that can solve differential equations numerically, solve the differential equation for the case that the board is released from -20 degrees, using the values R 5 m and g-_ 9.8 m/s2. Make a plot of against time for two or three periods. (b) On the same picture, plot the approximate solution (1.57) with the same -20. Comment on your two graphs. Note: If you haven't used the numerical solver before, you will need to learn the necessary syntax. For example, in Mathematica you will need to learn the syntax for "NDSolve" and how to plot the solution that it provides. This takes a bit of time, but is something that is very well worth learning