1. The problem statement, all variables and given/known data Hey everyone, I'm horrible at physics so bear with me if it's a really easy question. I was working a problem out, where I assigned my x-axis with cosine, and my y-axis with sine, like how I always thought it should be. However, in the solution, they assigned sine for the x-axis and cosine for the y-axis and therefore my results were backwards for T1 and T2. Was this a mistake in the book or in my understanding? If it's me, can someone please explain why the x-axis is given sine and the y-axis is given cosine? Thanks. I also provided a picture of the problem. 2. Relevant equations 3. The attempt at a solution Like I said I attempted the problem and I got the correct answers except my T1 and my T2 are mixed up because I put my x-axis as cos and my y-axis as sine, while the book did opposite.