Help me gysss....its importance......
1.multiple X²+4y²+Z²+2xz+XZ–2yz by (-z+x-2y).
2. prove that
(a+b+c)³-a³-b³-c³=3(a+b)(b+c)(c+a).
solve it....
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I think it will be correct.
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Anonymous:
thanks brother
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