Find T, N, and B for the curve r(t) = (20 cos(t), 20 sin(t), 7) at (20, 0, 7).
Hint: After finding T, plug in the specific value for t before computing N and B.
(Use symbolic notation and fractions where needed. Enter vectors in the form (*, *, *). Enter 0 for a null vector.)
T =
N =
B =