I am trying to prove the following trigonometric identity, but I am not getting the answer given by my textbook:
Could somoene please comment on my work?
Thank you very much.
*This question actually comes from my attempt to integrate , where . I arrived at the LHS of (*) and am trying to get the RHS.
1. The last expression doesn't match the textbook's given answer.
2. Also, could someone please justify the removal of the absolute value sign for the second term on the RHS ?
I know that so I can remove the absolute sign for this term, but is both negative and positive on this interval.