Andy Lee's answer to Michael Tan's Secondary 3 A Maths Singapore question.
done
{{ upvoteCount }} Upvotes
clear
{{ downvoteCount * -1 }} Downvotes
Hope the scribbling is clear enough. We have to use the identity cos(a-b) = cos a cos b + sin a sin b.
Then we can convert any expression in the form A cos x + B sin x into the format R cos (x - alpha).
Then we can convert any expression in the form A cos x + B sin x into the format R cos (x - alpha).
Date Posted:
1 year ago
360 Tutoring Program