Ask Singapore Homework?
Upload a photo of a Singapore homework and someone will email you the solution for free.
Question
secondary 4 | A Maths
2 Answers Below
Anyone can contribute an answer, even non-tutors.
please help thanks
Date Posted: 3 years ago
Views: 477
See 2 Answers
done
2 Upvotes
clear 0 Downvotes
use the formula where cos(a+b) = cos(a)cos(b) - sin(a)sin(b) and cos(a-b) = cos(a)cos(b) + sin(a)sin(b) to expand out the fraction. i hope you understand!
Date Posted:
3 years ago
360 Tutoring Program