Answers
Answers
＝－(－(a－b－c))＾2＋(a－b＋c)＾2
＝－(a－b－c)＾2＋(a－b＋c)＾2
a－b－c＝X , a－b＋c＝Yとおくと
＝Y＾2－X＾2
＝(Y＋X)(Y－X)
Y＋X＝2a－2b ,Y－X＝2c より
＝(2a－2b)×2c
＝4ac－4bc
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ありがとうございます！