Find the length of the curve given by the parametric representation.... 1. The problem statement, all variables and given/known data Calculate the length of the curve given by the parametric representation r(t) = t2(cos t; sin t; cos 2t; sin 2t) for 1≤ t ≤+1: 2. Relevant equations 3. The attempt at a solution I know that you need to assume: dx/dt ≥ 0 for α≤t≤β Then you use the formula for 'L' Imstruggling with the layout of the question.. Why are there semi-colons between the sin and cos terms? If someone could explain this that would be great. Regards as always.