Given "a" and "b" unit vectors, a) if the angle between them is 60 degrees, calculate (6a + b) product dot (a - 2b) I'm clueless about this question.
Follow Math Help Forum on Facebook and Google+
Originally Posted by Macleef Given "a" and "b" unit vectors, a) if the angle between them is 60 degrees, calculate (6a + b) product dot (a - 2b) Now use $\displaystyle \cos (60^ \circ ) = \frac{{a \cdot b}}{{\left\| a \right\|\left\| b \right\|}} = a \cdot b$ to finish.
View Tag Cloud