3 3 3 x y z --------------- + --------------- + --------------- (x - y)*(x - z) (y - x)*(y - z) (x - z)*(y - z)
3 3 3 x y z --------------- + --------------- + --------------- (x - y)*(x - z) (y - x)*(y - z) (x - z)*(y - z)
x^3/((x - y)*(x - z)) + y^3/((y - x)*(y - z)) + z^3/((x - z)*(y - z))
/ 3 3 \ 3 (x - z)*(y - z)*\x *(y - x)*(y - z) + y *(x - y)*(x - z)/ + z *(x - y)*(x - z)*(y - x)*(y - z) ---------------------------------------------------------------------------------------------- 2 2 (x - y)*(x - z) *(y - x)*(y - z)
3 3 3 x *(y - x)*(y - z) + y *(x - y)*(x - z) + z *(x - y)*(y - x) ------------------------------------------------------------ (x - y)*(x - z)*(y - x)*(y - z)
3 3 3 x y z --------------- + --------------- + --------------- (x - y)*(x - z) (y - x)*(y - z) (x - z)*(y - z)