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If `x^2+y^2+z^2 ne0, x=cy+bz,y=az+cxandz=bx+ay" then "a^2+b^2+c^2+2abc=`

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If `x^2+y^2+z^2 ne0, x=cy+bz,y=az+cxandz=bx+ay" then "a^2+b^2+c^2+2abc=`
A. 2
B. a + b + c
C. 1
D. ab + bc + ca
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Correct Answer - c
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