1. $2\stackrel{\wedge }{i}-2\stackrel{\wedge }{j}+6\stackrel{\wedge }{k}$

• A. $\pm \frac{{\displaystyle \stackrel{\wedge }{i}}+{\displaystyle \stackrel{\wedge }{j}}}{\sqrt{2}}$
• B. $\pm \frac{{\displaystyle \stackrel{\wedge }{i}}+{\displaystyle \stackrel{\wedge }{j}}}{\sqrt{2}}$
• C. $\pm \frac{{\displaystyle \stackrel{\wedge }{i}}+{\displaystyle \stackrel{\wedge }{j}}}{\sqrt{2}}$
• D. $\pm \frac{{\displaystyle \stackrel{\wedge }{i}}+{\displaystyle \stackrel{\wedge }{j}}}{\sqrt{2}}$

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