Question

Find the angle between the two vectors u, and v if u= <3,1> and v=<2,-3>

Answer 1

You know that v.u (scalar product) is equal to: |v||u|cos(a),(a is the angle) so cos(a)=v.u/(|v||u|), and soooo angle a=acos(v.u/(|v||u|)) calculate you scalar product with the coordinates and you made it! (wait, you know scalar product?)

Answer 2

somewhat..

Answer 3

Sorry I'm not english, what you mean for somewhat? :3

Answer 4

i dnt know much about it

Answer 5

Ok, trigonometric function? Sine cosine.. etc?

Answer 6

What is the math you have studied to resolv this problem? :)

Answer 7

yes i know sine and cosine i am currently taking trigonometry

Answer 8

So this is a problem of angle of a triangle, draw your vectors :)