Exercise 2.4.4: (back)

Q. (somef 10 20)
procedure somef: expects 1 argument, given 2: 10 20

A. The definition somef only accepts 1 argument


Q. (somef 10)
sin: expects 1 argument, given 2: 10 10

A. The somef definition contains (sin x x).  This is wrong as sin can only accept one
   argument.