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Question

(xaxb)a+b×(xbxc)b+c×(xcxa)c+a = ____.

A
-1
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B
1
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C
2
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D
-2
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Solution

The correct option is A 1
(xaxb)a+b(xbxc)b+c(xcxa)c+a

xa2+abxb2+bcxc2+caxab+b2xbc+c2xac+a2

x(a2+b2+c2+ab+bc+ca)x(a2+b2+c2+ab+bc+ca)=1

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