i apologise if this is the incorrect forum, i assume it would go under here or perhaps calculus forum - vector help!
find the formula for in terms of , and
thankyou so much in advance!
This question belongs, me believes ,in trigonometry-analytic geometry. Anyway:
is an arrow beginning at and ending at and is its length, so using the cosines law (theorem) on the resulting triangle we get:
I'm not sure what is , but if you meant the dot product of these two vectors then just remember that , so you can substitute above.