00:01
Okay, so to start off this problem, i'm going to go ahead and rewrite the right hand side.
00:05
So i have the d r, d s is going to be e to the r times e to the negative 2s.
00:14
And this is, oh, we can go ahead and move the e to the r to the left hand side.
00:21
So i have 1 over e to the r, dr equals to 1 over e to 2s, ds.
00:29
And so i'm going to integrate both sides.
00:38
So the left -hand side, it's going to integrate to negative e to the negative r.
00:46
And the right -hand side, it's going to integrate to negative 1 -5 -e to the negative 2s plus c.
01:00
We can multiply by a negative.
01:03
So we'll have that e to the negative r equals to 1 -half, e to the negative 2s plus c...
