Modify your code $($sine$\_$series, from Problems $2$ & $3)$ so that it uses a

default value of n $=5$ if the user does not specify a value for n$.($Hint:

Use the function nargin.$)$

To demonstrate that your code works:

a$)$ Evaluate the function with x $=$ p$/6$ and n $=2$;

b$)$ Evaluate the function with x $=$ p$/6,$ and no input for n