I need to verify lxl+lyl= 1 . I have set up the four cases: X greater/equal to 0 and y is greater/equal to 0 , x is greater/equal to 0 and y is less than 0, x is less than o and y is greater/equal to 0 , and x is less than 0 and y is less than 0... Im having a hard time verifying these.. help please??