Converting a vector length to a vector: |w2| = a cos β cos α I got up to this point with no issues; then the next step in the solution confused me. w2 = a cos β cos α

Question

Converting a vector length to a vector:

|w2| = a cos β cos α
I got up to this point with no issues; then the next step in the solution confused me.

w2 = a cos β cos α<cos(α + β),sin(α + β)>

phi · Answer

can you give a link to the problem, or describe it more clearly ?

anonymous · Answer

It is the question 3B in problem set 1: part2 questions: http://ocw.mit.edu/courses/mathematics/18-02sc-multivariable-calculus-fall-2010/1.-vectors-and-matrices/part-a-vectors-determinants-and-planes/problem-set-1/MIT18_02SC_pset1.pdf answers http://ocw.mit.edu/courses/mathematics/18-02sc-multivariable-calculus-fall-2010/1.-vectors-and-matrices/part-a-vectors-determinants-and-planes/problem-set-1/MIT18_02SC_pset1sol.pdf:

phi · Answer

First , some background
|dw:1427474911548:dw|