00:01
First, let's go ahead and recall that when we're taking the derivative with respect to tau, the chain rule that we're doing is this.
00:13
Okay, and let's go ahead and write down what r is, our vector valued function, and we know that we have, we have t is equal to 4 tau plus 1.
00:27
Okay, so we have drdt times d t d t, t, and you.
00:39
And, well, let's take the, this is going to be one, two, t, and then the derivative of t with respect to tau is four.
00:54
That's four, p .t.
00:57
And let's go ahead and plug in for t in terms of tau.
01:01
That gives us 32 tau plus eight...