Find the unit tangent, normal and binormal vectors T,N,B , and the curvature of the curve
x=−4t y=−t2 z=−2t3 at t=1.
The Attempt at a Solution
I found T=(-4/sqrt(56),-2/sqrt(56),-6/sqrt(56)) which is correct. But I keep getting N wrong? PLease help me, thank you!