Jason76 Oct 2012 1,314 21 USA Dec 4, 2015 #1 Formula to find the angle between vectors: \(\displaystyle |a|\,\,|b| = \cos\theta\) or \(\displaystyle \cos\theta = \dfrac{a\,\,*\,\,b}{|a|\,\,|b|}\) where a and b are vectors When should we use one formula rather than the other?

Formula to find the angle between vectors: \(\displaystyle |a|\,\,|b| = \cos\theta\) or \(\displaystyle \cos\theta = \dfrac{a\,\,*\,\,b}{|a|\,\,|b|}\) where a and b are vectors When should we use one formula rather than the other?

P Plato MHF Helper Aug 2006 22,507 8,664 Dec 4, 2015 #2 Jason76 said: Formula to find the angle between vectors: \(\displaystyle {a\cdot b} ={|a|\,\,|b|} \cos\theta\) or \(\displaystyle \cos\theta = \dfrac{a\,\,*\,\,b}{|a|\,\,|b|}\) where a and b are vectors When should we use one formula rather than the other? Click to expand... Well if you know middleschool basic algebra, then you realize they are identical. Last edited: Dec 4, 2015

Jason76 said: Formula to find the angle between vectors: \(\displaystyle {a\cdot b} ={|a|\,\,|b|} \cos\theta\) or \(\displaystyle \cos\theta = \dfrac{a\,\,*\,\,b}{|a|\,\,|b|}\) where a and b are vectors When should we use one formula rather than the other? Click to expand... Well if you know middleschool basic algebra, then you realize they are identical.