Problem 10.8#4

Hey Prof. Taylor,

I don't understand why I'm getting the wrong answer for

Tanget Unit Vector. I was able to get the Normal Unit Vector fine which

requires TUV in the first place. To find it, I did r' / |r'|.

*************************

ehr...it looks like you've computed |r'|=17...but r'=4sin(-4t)i-4cos(-4t)j -4k, so  |r'|=√(16sin^2(-4t)+16cos^2(-4t)+16)=√32=5.66.