(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

Let [itex] c(t) = ( cos(At), sin(At), 1) [/itex] be a curve. (A is a constant)

Show that the normal to [itex] c(t) [/itex] is always directed toward the z-axis.

3. The attempt at a solution

I am not sure how to show this. (For example, is the question "asking" us to show the cross product of something is 0 ?) If you tell me how to start the problem, I should have no problem.

I have found the normal, which is [itex] N(t) = ( -cos(At), -sin(At), 0) [/itex].

Thanks.

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# Homework Help: Parametric curve and normal

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