If x, y and z are real numbers, then \({x}^{2}+4{y}^{2}+9{z}^{2}−6yz−3zx−2xy\) is always
Q1
If x, y and z are real numbers, then
\({x}^{2}+4{y}^{2}+9{z}^{2}−6yz−3zx−2xy\) is always
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