Show that the curve

γ(t)=(t²-t+1,t³-t)

has exactly one self-intersection point and finnd the two unit tangent vectors (in the direction of increasing t) at this point.

I have found the self intersection. I know that a unit tangent vector is the derivative of each component>But the wording has me a bit confused.What does it mean "in the direction of increasing t at this point"?