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Q.

x2+y2+z2yzzxxy=( given x=b+c,y=c+a,z=a+b)

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a

a2+b2+c2bccaab

b

a2b2+c2bcca+ab

c

a2b2c2+bc+caab

d

a2+b2+c2

answer is A.

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Detailed Solution

x2+y2+z2yzzxxy=
Given x=b+c,y=c+a,z=a+b
x2+y2+z2yzzxxy=(b+c)2+(c+a)2+(a+b)(c+a)(a+b)(a+b)(b+c)(b+c)(c+a)=b2+c2+2bc+c2+a2+2ac+a2+b2+2abacbca2ababacb2bcbcabc2ac=a2+b2+c2bccaab

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