Show that [-2a a+b c+a
a+b -2b b+c
c+a c+b -2c]matrice=4(a+b) (b+c) (c+a)
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=(a+b+c) a2 +b2+ c2+295 2bc+2ba)
=(a+b+c2)
answer (a+b+c3)
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