Which of the following are identities? Check all that apply.

b

Step-by-step explanation:

thats funny i just did that

check all the answers except cos(x+y)+cos(x-y)=cos^2 x-sin^2 y

Step-by-step explanation:

took the test and hopefully mine was the same as the image above

arithmetic sequence

step-by-step explanation:

given that a sequence has terms as

19, 15, 11,

this is represented on a graph

the pattern indicates that the sequence is an arithmetic sequence with i term

a=19 and common difference d =-4

any general term

thus the sequence is reduced by 4 for each successive term starting from 1 and nth term is

24-5n.

first negative term would start after 5th term

5th term =24-25< 0

from 5th term onwards the sequence would be negative.

stop cheating

step-by-step explanation: