Ask Singapore Homework?

Upload a photo of a Singapore homework and someone will email you the solution for free.



Question

junior college 1 | H2 Maths
One Answer Below

Anyone can contribute an answer, even non-tutors.

Answer This Question
Charles
Anonymous

junior college 1 chevron_right H2 Maths chevron_right Singapore

Need help with this qn.

Date Posted: 4 months ago
Views: 39

See 1 Answer

done {{ upvoteCount }} Upvotes
clear {{ downvoteCount * -1 }} Downvotes
Jair Goh
Jair Goh's answer
4 answers (Tutor Details)
1st
Since u is reduced to a unit vector in the end, it does not matter which u you use. You modulus the thing because acute angles must be positive. (0,0,1) is just a vector on the z axis