1. The problem statement, all variables and given/known data See attached image 2. Relevant equations 3. The attempt at a solution Why use x=2sint?? Would it be incorrect to use the x=2cost (versus the given x=2sint)? My professor instructed us to not use the given parameters in the book and to come up with our own, and I would of used x=2cost which would of changed the resulting vector-valued function (Resulting in r = 2Cos(t)i+2Sin(t)j+4Cos2tk) Thanks.