Dear Math Help Forum members,

This question has been niggling me for an hour. I couldn't solve it and I am in a dire situation. Please give me advice as to how to solve this question (don't overlook the parts). I would like to have your comments as soon as possible. All I know is that for part (a), the answer is 2 x 1.3rad. = 2.6rad.

Thank you so much and have a nice day.