1. find sin? if cos? =1/2 and ? terminates in quadrant iv. 2. find cos? if sin? =(? 2)/2 and ? terminates in quadrant i. 3. find tan? if cos? =-1/2 and ? terminates in quadrant ii. 4. find tan? if sin? =-1 and 0? ? < 2? radians.

1. in quadrant IV means , so

2. in quadrant I means . Then

3. in quadrant II means . Then

4. If , then , so is undefined.

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.

go on the tube you might find some information there