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	Các bình luận về: Trong không gian \(Oxyz,\) cho đường thẳng \(d:\frac{{x + 2}}{4} = \frac{{y &#8211; 1}}{{ &#8211; 4}} = \frac{{z + 2}}{3}\) và mặt phẳng \(\left( P \right):2x &#8211; y + 2z + 1 = 0\). Đường thẳng \(\Delta \) đi qua \(E\left( { &#8211; 2\,;\,\,1\,;\, &#8211; 2} \right)\), song song với \(\left( P \right)\) đồng thời tạo với \(d\) góc bé nhất. Biết rằng \(\Delta \) có một vectơ chỉ phương \(\vec u = \left( {m\,;\,n\,;\,1} \right).\) Tính \(T = {m^2} &#8211; {n^2}\).	</title>
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