Show that the function \( z=2 x^{2}+2 x y+y^{2}-2 x+ \) \( \mathrm{...

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Show that the function \( z=2 x^{2}+2 x y+y^{2}-2 x+ \)
\( \mathrm{P} \) \( 2 y+2 \) is not smaller than -3 .

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