Let and form an orthonormal basis for and let be a unit vector in . If , determine the value of Can someone help me begin this problem, thank you!
Follow Math Help Forum on Facebook and Google+
Note that: (all of our vectors are unit vectors) is one of the angles between the vectors But we also know that: and since it's a orthogonal basis Now try to work with a bit of trigonometry and you'll get the answer
View Tag Cloud