Hey guys so I had trouble with this problem, I hope it's not too long and you can help me out. 1. The problem statement, all variables and given/known data A point moves following (starting at λ = 0 and increasing): x = 4·cn(λ) y = 3·sn(λ) z= am(λ) Find the distance the point has traveled when the speed vector is parallel to (-4, 3, √2). 2. Relevant equations The elliptic functions are of the first kind with k2 = 1/2. 3. The attempt at a solution I thought of the following: v = dp/dt = (-4·sn(λ)·dn(λ), 3·cn(λ)·dn(λ), dn(λ))·(dλ/dt) = c·(-4, 3, √2) (with c a constant real number) But then I don't know what to do next... Thank you so much for your help!