If \( a, b, c, x, y, z \) are real quantities, and
\[
(a+b+c)^{2}=3\left(b c+c a+a b-x^{2}-y^{2}... VIDEO
If \( a, b, c, x, y, z \) are real quantities, and
\[
(a+b+c)^{2}=3\left(b c+c a+a b-x^{2}-y^{2}-z^{2}\right) \text {, }
\]
shew that \( a=b= \) cand \( x=0, y=0, z=0 \).
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