( X1 - X2 )3 = X13 - 3X21 X2 +3X1X22- X32 X13 - X32 = (X1...
19)
( x1
- x2
)3
= x1
3
- 3x2
1
x2
+3x1
x2
2
- x3
2
x1
3
- x3
2
= (x1
- x2
)3
- 3x1
x2
( x1
- x2
)1
- x2
)3
= x1
3
- 3x2
1
x2
+3x1
x2
2
- x3
2
x1
3
- x3
2
= (x1
- x2
)3
- 3x1
x2
( x1
- x2
)