Create a function called either-zero? that takes two parameters and returns true if one of the parameters is zero or false if neither are zero > (either-zero? 1 0) #t > (either-zero? 1 1) #f Part B: Create a function called same-sign? it should take two parameters. It should return #t if both are positive or both are negative and false if they are not. > (same-sign? -1 1) #f > (same-sign? -1 -1) #t