Develop two user defined functions $($myF and myG$)$ which calculate the following equations;

a$)$ myF $=($A $+$ B$)+($C $+$ D$)/$ A

b$)$ myG $=($A $*$ B$)/$ C $^$ D

And, test your own functions by using the values given on the sheet $$P$4.$ Remember that these functions must have four arguments $($A$,$ B$,$ C and D$).$