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t_n_p
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Homework Statement
http://img21.imageshack.us/img21/8175/46521897.jpg
The Attempt at a Solution
I think I have a starting point, but I'm not 100% sure
Basically I thought of just computing grad(f(α(t)) · dα/dt and showing its equal to zero.
Am I on the right track, or shall I try another approach?
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