y + c /c c \ -----*|- - -----| c \y y + c/
((y + c)/c)*(c/y - c/(y + c))
c*(c + y) - c*y --------------- c*y
(c*(c + y) - c*y)/(c*y)
/1 1 \ (c + y)*|- - -----| \y c + y/
/c c \ (c + y)*|- - -----| \y c + y/ ------------------- c
(c + y)*(c/y - c/(c + y))/c
/c c \ (c + y)*|- - -----| \y c + y/ ------------------- c
(c + y)*(c/y - c/(c + y))/c
/c c \ (c + y)*|- - -----| \y c + y/ ------------------- c
(c + y)*(c/y - c/(c + y))/c