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Math Help - Find the vectors T, N, and B at the given point.

  1. #1
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    Find the vectors T, N, and B at the given point.

    Find the vectors T, N, and B at the given point.

    r(t) = {cos(t), sin(t), ln(cos(t))}, (1,0,0)

    I got as far as T= ((-sin(1)/sec(1)), 1, 0) but apparently my x value is wrong and that stopped me from doing the rest of the problem.
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  2. #2
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    You see that this curve goes through the point (1,0,0), when t = 0.

    Then you use t=0 in T, not (1,0,0), so you have T = (((-sin(0)/sec(0)), 1, 0) = (0,1,0)

    Hope that helps
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