Answer:
1. Introduction, body and conclusion like other news stories
2. An objective explanation of the issue, especially complex issues
3. A timely news angle (which means it is presently in the news)
4. Opinions from the opposing viewpoint that refute directly the same issues the writer addresses
5. The opinions of the writer delivered in a professional manner. Good editorials engage issues, not personalities and refrain from name-calling or other petty tactics of persuasion.
6. Alternative solutions to the problem or issue being criticized. Anyone can gripe about a problem, but a good editorial should take a pro-active approach to making the situation better by using
constructive criticism and giving solutions.
7. A solid and concise conclusion that powerfully summarizes the writer's opinion. Give it some punch.
Explanation:
There is a subtle difference between Arctan and arctan
Arctan(x) is an inverse function such that the range is only the principla value
meanwhile, arctan(x) takes on infinitely many values
hope this helps
The answer is going to be A