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.
A trigonometric identity problem is a type of mathematical problem that involves manipulating trigonometric equations to prove or disprove an identity. This often involves using algebraic techniques and knowledge of trigonometric functions to simplify and solve the equations.
Trigonometric identity problems are important because they help us understand the relationships between different trigonometric functions and how they can be manipulated. They also have many practical applications in fields such as engineering, physics, and navigation.
Some common strategies for solving trigonometric identity problems include using trigonometric identities, using algebraic techniques such as factoring and substitution, and using basic trigonometric properties such as symmetry and periodicity.
Some common challenges when solving trigonometric identity problems include knowing which identities to use, deciding on the best approach for solving the problem, and carefully managing and simplifying complex equations.
To improve your skills in solving trigonometric identity problems, it is important to have a strong understanding of basic trigonometric functions and identities. Practice regularly with different types of problems, and seek help from teachers or online resources when needed.