Ask Singapore Homework?
Upload a photo of a Singapore homework and someone will email you the solution for free.
Question
secondary 4 | A Maths
3 Answers Below
Anyone can contribute an answer, even non-tutors.
Morning!!!! can someone please help me with this qns ? Thx youuuu
Date Posted: 4 years ago
Views: 300
See 3 Answers
done
{{ upvoteCount }} Upvotes
clear
{{ downvoteCount * -1 }} Downvotes
Keep Trying, you can do it;)
Date Posted:
4 years ago
One correction. Cos theta/2 cannot stay +-. This is because theta/2 is guaranteed to be between 90 and 135 and so its cosine will have a negative value.
Good Catch, Thank you Eric. ;)
done
{{ upvoteCount }} Upvotes
clear
{{ downvoteCount * -1 }} Downvotes
Good morning Sonia! I hope you have made good progress in your revision! Here is my variant of the workings.
I used a basic angle’s triangle instead so that I do not have to worry about where to place the negative signs in the triangle. Instead, I place a negative sign afterwards in front of the sine, cosine or tangent based on my knowledge of A-S-T-C.
We use the double angle formula in both cases and we have to determine the direct quadrant in which the new angles lie in.
Let me know if you need more explanation and I will do my best to explain them again.
I used a basic angle’s triangle instead so that I do not have to worry about where to place the negative signs in the triangle. Instead, I place a negative sign afterwards in front of the sine, cosine or tangent based on my knowledge of A-S-T-C.
We use the double angle formula in both cases and we have to determine the direct quadrant in which the new angles lie in.
Let me know if you need more explanation and I will do my best to explain them again.
Date Posted:
4 years ago
Thank you so much Eric! I’ve made some improvements and i’m so happy! i hope i can perform well in my upcoming Os :(
360 Tutoring Program