1103030505

SubArea: 
Points and Vectors
Level: 
B
Project ID: 
1103030505
Accepted: 
1
Clonable: 
0
Easy: 
0
The vectors \( \vec{u} \) and \( \vec{v} \) are given by the figure. Find cosine of the angle \( \varphi \) between \( \vec{u} \) and \( \vec{v} \). Help: Use the dot product of the given vectors.
\( \cos\varphi=-\frac9{17} \)
\( \cos\varphi=\frac9{17} \)
\( \cos\varphi=\frac{\sqrt{17}}{2\sqrt{13}} \)
\( \cos\varphi=-\frac{\sqrt{17}}{2\sqrt{13}} \)