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## Homework Statement

Find the unit tangent, normal and binormal vectors T,N,B , and the curvature of the curve

x=−4t y=−t

^{2}z=−2t

^{3}at t=1.

## Homework Equations

## 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!