Let a,b,c be any real numbers. Suppose that there are real numbers x,y,z not all zero such that x=cy+bz,y=az+cx and z=bx+ay. Then a2+b2+c2+2abc is equal to
A
0
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B
1
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C
2
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D
−1
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Solution
The correct option is A 1 For x,y,z not to be simultaneously zero