If C (dot) C= IC^2I how can I prove cosine law with vectors?
Follow Math Help Forum on Facebook and Google+
Originally Posted by Clairvoyantski If C (dot) C= IC^2I how can I prove cosine law with vectors? Use this property: where is the angle between and . Form a triangle with and as two of its sides. The remaining side is represented by . Squaring the length of this side gives Now just finish it up.
View Tag Cloud