Recent content by kiwilava

since that doesn't matter, then I've proved n.(r(t)-r(0))=0 for all t , thanks for your help once again

does it matter if i find the normal using n=(r(1)-r(0))x(r(-1)-r(1))?

Oh i see, thanks for your help! ^_^

do you know how i can find the curve obtained as the orthogonal projection of the curve S in the yz-plane? or did i already find the answer?

the two surfaces are x=y^2+z^2 and x-2y+4z=0, i substituted x in the second equation.. is that correct?

Homework Statement curve S is the intersections of two surfaces, i have to find the curve obtained as the orthogonal projection of the curve S in the yz-planeHomework Equations how do i find the orthogonal projection of curve S??The Attempt at a Solution i found the equation of curve S to be...

no, we were giving the parametric equations for the curve only, and need to show that the curve is contained in a plane. so what i did was let t=0,-1,1 so obtain 3 points on the curve, and then subtracting the points, i found 3 vectors, then i cross product two of the vectors, and dot product...

Hi, regarding in this question of how to prove the curve is contained in a plane. You said i need to work with tangent vectors, so i find the tangent vector for the curve, then do i just take any t (t=0, t=1) to find two nonparallel tangents to compute for the normal?