1. The problem statement, all variables and given/known data Find the curvature [tex]\kappa(t)[/tex] of the curve [tex]\\r(t)=(2sint)i +(2sint)j +(3cost)k[/tex] 2. Relevant equations [tex]\\\k(t)= (\left|T'(t)\right|) / (\left|r'(t)\right|)[/tex] 3. The attempt at a solution I found [tex]\\\\r'(t)= (2cost)i + (2cost)j + (-3sint)k[/tex] [tex]\\\\\ \left|r'(t)\right|= sqrt((2cost)^2 + (2cost)^2 + (-3sint)^2 \left|r'(t)\right|=sqrt((4cost)^2+(-3sint)^2) \left|r'(t)\right|=sqrt(4+-3) \left|r'(t)\right|=sqrt(1) [/tex] I think this is where I'm getting caught up. I wont go any further becuas I'm postive I messed up the sin cos relationship when finding the magnitude of r'(t). For all I know, I could have made another mistake along the way. I understand the equations we are using in this course(Calc III), but I almost always find myself getting caught up on the basic mathematics. Can any help lead me in the right direction for this problem?