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28. Prove that (a+b)the hole cube+(b+c)the Hole cube+(c+a)the hole cube-3(a+b)(b+c)(c+a)=2(a cube+b cube +c cube-3abc) |
| Answer» 28. Prove that (a+b)the hole cube+(b+c)the Hole cube+(c+a)the hole cube-3(a+b)(b+c)(c+a)=2(a cube+b cube +c cube-3abc) | |