Question

For this question (http://f.imgtmp.com/DYsy5.jpg), it's asking me to show that a curve intersects a surface at a right angle at a certain given point and I'm thinking I need to take the gradient of each and dot product them and get 0 but how do I do that for the PARAMETRIC curve? (I did d/dt of each component and ended up with a normal vector that's a constant multiple of the other.)

Answer 1

The link is: http://f.imgtmp.com/DYsy5.jpg .