"box of primes" over l V X a l ^2 1. The problem statement, all variables and given/known data Find B, and t for these space curves (t = torsion) r(t) = (3sint)i + (3cost)j + 4tk 2. Relevant equations Ok, so in my textbook i have two different equations to find the answer to this. the "box of primes" over l V X a l ^2 method which im NOT ALLOWED to use. i am supposed to get torsion using t = -dB/ds N When i use the latter, i keep getting -4, but with the long definition i can get -4/25 (the right answer) 3. The attempt at a solution I calculate -dB/ds as (4sinti + 4costj) and N (-sint - cost) im a little confused and getting lost in all the different definitions of everything!!! anyone care to shed a little light thanks in advance!!