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If( a + b) 2+(b+c) 2+(c+d)2=4(ab +bc+cd) ​​​​​​which is correct 1)a+b+c+d=0 2)a=b=c=d 3)a/b+b/c+c/d=1 4)a 2/b 2 +c 2/d 2=1

Answer» If( a + b) 2+(b+c) 2+(c+d)2=4(ab +bc+cd)
​​​​​​which is correct
1)a+b+c+d=0
2)a=b=c=d
3)a/b+b/c+c/d=1
4)a 2/b 2 +c 2/d 2=1


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