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\begin{array} { l } { \text { If } x + y - z = 4 \text { and } x ^ { 2 } + y ^ { 2 } + z ^ { 2 } = 30 \text { , then find the } } \\ { \text { value of } x y - y z - z x \text { . } } \end{array} |
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Answer» no thanks a lot for your help. |
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