The compliment of an angle is `90-theta` (or `pi/2-theta` ), because if `alpha+beta=90` then `alpha` and `beta` are complimentary.
So the sine of the compliment is the cosine.
We have a Math tutor online right now to help you!
To chat with a tutor, please set up a tutoring profile by creating an account and setting up a payment method. If you initiate a chat, please note you will be charged $0.50 a minute for tutoring time.