00:01
So my approach to finding this arc length would be to rewrite it as f of x instead of y equals.
00:07
It's just my habit of doing things.
00:09
We have two -thirds of one plus x squared to the three -halfs power.
00:21
So let's find the derivative of that.
00:24
So it can basically the chain rule, two -thirds times three halves will cancel.
00:29
Just make sure you subtract one from your exponent.
00:31
Leave the inner function alone, but then you have to multiply by the derivative of the inside, the derivative of x squared is 2x.
00:39
So now we can find the arc length.
00:43
They give us the bounds to be from 0 to 1 of the square root of 1 plus f prime of x, which is, i'll just put it in parentheses, that square root of 1 plus x squared times 2x.
01:08
Squared dx.
01:09
Just double checking that i have the right formula, which i do...