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

Here's a worked problem, I can't understand how they have evaluated T at the given point (in part c):

[PLAIN]http://img31.imageshack.us/img31/3725/97856984.gif [Broken]

3. The attempt at a solution

I just substituted [tex](0,1, \pi/2)[/tex] into r'(s) but

[tex]\frac{1}{\sqrt{2}} cos \left(\frac{1}{\sqrt{2}}\right) = \frac{1}{\sqrt{2}} \neq 0[/tex]

[tex]\frac{1}{\sqrt{2}}. -sin \left(\frac{0}{\sqrt{2}}\right) = 0 \neq \frac{-1}{\sqrt{2}}[/tex]

Why is it that I'm not getting the right answer? Is there something else I need to do here?

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# Homework Help: Space curve tangent vector

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