The discussion centers on a trigonometric identity problem involving quadrants in a coordinate system. Participants identify a potential typo regarding the placement of angle $B$ in either Quadrant I (QI) or Quadrant III (QIII). Despite the typo, it is concluded that the answers remain consistent regardless of the quadrant due to the nature of trigonometric functions. However, one participant raises a valid concern about the sign changes that occur when switching quadrants, which could affect the final answer.
PREREQUISITESStudents studying trigonometry, educators teaching trigonometric concepts, and anyone interested in understanding the nuances of trigonometric identities and their quadrant implications.
Yes, perhaps that's the case, but wouldn't the answers be different considering the quadrant difference (e.g., the sign switch for the answer in (a))?https://uploads.tapatalk-cdn.com/20180601/a861c1250b3bd26b068231593e477c43.jpghttps://uploads.tapatalk-cdn.com/20180601/a09baa55d2efcec59dbda1570322f355.jpgOlinguito said:Yes, it looks like a typo. However the answers are the same whether $B$ is in QI or QIII.