Follow Math Help Forum on Facebook and Google+
Originally Posted by afeasfaerw23231233 hello, you have almost finished: That's it!
well, but the answer in my textbooks says theta is 120 degree!! how can i get 120 degree from this?
Originally Posted by afeasfaerw23231233 well, but the answer in my textbooks says theta is 120 degree!! how can i get 120 degree from this? u and v are unit vectors, so |u| = |v| = 1. We are also told that u + v is a unit vector, so (Since for any vector x, .) But What can you make of all this? -Dan
oh, i know it now. thanks!
View Tag Cloud