Răspuns:
[tex]1. \frac{ \sqrt{2} }{2} \\ 2. \frac{2 \sqrt{3} }{3} \\ 3. - \sqrt{5} \\ 4. \frac{3 \sqrt{6} }{2} \\ 5. \sqrt{10} \\ 6. \frac{ - 8 \sqrt{30} }{10} [/tex]
