Cho tập A = {1, 2, 3, 4, 5, 6, 7}, tập B = {2, 3, 8, 1, 7, 9}. Tập \[\left( {A - B} \right) \cup \left( {B - A} \right)\]là: 

A. \[{\rm{\alpha }} < 3,{\rm{\beta }} < 0\]

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B. \[{\rm{\alpha }} > 3,{\rm{\beta }} < 0\]

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C. \[{\rm{\alpha }} > 3,{\rm{\beta }} > 0\]

D. \[{\rm{\alpha }} < 3,{\rm{\beta }} > 0\]</>

A. \(\alpha > 0\)

B. \(\alpha \le 0\)

C. \(\alpha > 1\)

D. \(\alpha \ge 1\)

A. \[{{\rm{d}}^{\rm{2}}}{\rm{z = 2cos2xd}}{{\rm{x}}^{\rm{2}}}{\rm{ + }}{{\rm{e}}^{{{\rm{y}}^{\rm{2}}}}}{\rm{(4}}{{\rm{y}}^{\rm{2}}}{\rm{ + 2)d}}{{\rm{y}}^{\rm{2}}}\]

B. \[{{\rm{d}}^{\rm{2}}}{\rm{z = 2cos2xd}}{{\rm{x}}^{\rm{2}}}{\rm{ + 2}}{{\rm{e}}^{{{\rm{y}}^{\rm{2}}}}}{\rm{d}}{{\rm{y}}^{\rm{2}}}\]

C. \[{{\rm{d}}^{\rm{2}}}{\rm{z = }} - {\rm{2cos2xd}}{{\rm{x}}^{\rm{2}}}{\rm{ + 2y}}{{\rm{e}}^{{{\rm{y}}^{\rm{2}}}}}{\rm{d}}{{\rm{y}}^{\rm{2}}}\]

D. \[{{\rm{d}}^{\rm{2}}}{\rm{z = cos2xd}}{{\rm{x}}^{\rm{2}}}{\rm{ + }}{{\rm{e}}^{{{\rm{y}}^{\rm{2}}}}}{\rm{d}}{{\rm{y}}^{\rm{2}}}\]