Question #245544

You are given two vectors a=(2,3,4)\mathbf{a}=(2,3,4) and b=(0,2,1)\mathbf{b}=(0,2,1)

Which of the following is/are true?


  1. a is perpendicular to b.
  2. The angle between a and b is arccos(2529)\arccos \left(2\sqrt{\frac{5}{29}}\right)
  3. The vector a+2b\mathbf{a}+2\mathbf{b} is parallel to vector b
  4. The direction cosines of the vector a+b are arccos(236)\arccos \left(\frac{2}{3\sqrt{6}}\right)arccos(536)\arccos \left(\frac{5}{3\sqrt{6}}\right) ,and arccos(536)\arccos \left(\frac{5}{3\sqrt{6}}\right)
  5. 12a13b=(1,136,73)\frac{1}{2}\mathbf{a}-\frac{1}{3}\mathbf{b}=\left(1,\frac{13}{6}, \frac{7}{3}\right)




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