Question:Find one point on the curve defined by the vector r(t)=(2cost,t(root of 5),2sint) where the normal plane is perpendicular to the unit tangent vector T(t)=(-2sint/3,root5/3,2cost/3).
Hopefully you can answer this. Thanks

Are you sure about the exact words of the problem?

Cause it looks to me that such as it is, the answer is any point, cause at any point the normal plane would be perpendicular to the tangent vector.... :shock: