3D Vector Calculations: A Beginner's Guide

[ThomasHW]

Homework Statement

http://www.tunerspec.ca/school/3dvector.jpg

Homework Equations

$$c^{2} = a^{2} + b^{2} - 2ab \times cos \alpha$$
$$\frac{sin a}{a}$$ = $$\frac{sin b}{b}$$

The Attempt at a Solution

I really don't know where to get started... I don't want someone to just do it for me - just a little help would be nice. :)

 

[Astronuc]

One could use direction cosines.

Direction Angles and Direction Cosines
http://www.geom.uiuc.edu/docs/reference/CRC-formulas/node52.html