D, solved it graphically
How do you turn a fraction (1/6) into a decimal?
2 answers:
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The tangent vector to r(<em>t</em>) at any <em>t</em> in the domain is
At <em>t</em> = π/6, the tanget vector is
To get the unit tangent, normalize this vector by dividing it by its magnitude:
So the unit tangent at the given point is