r(t) = <3t, (t-1)>
find
a) Dt[r(t) dot u(t)]
b) Dt[u(t) - 2r(t)]
c) Dt[||r(t)||], t > 0
d) Dt[r(t) x u(t)]
i don't understand what i am have to do for these problems
For the second one as Chris pointed out
So
So
Next we have
so
Lastly we have
Which actually doesnt make sense, because you have a vector in and the cross product is only defined in
Off topic , how do you represent cross product, the representation I used isn't very nice looking. I tried \cross, but to no avail