00:01
Alright, in your question you're to evaluate the integral by making the given substitution.
00:05
And then use c for the constant of integration.
00:08
So they've given you the u substitution, so what you want to start with is take the derivative of that u substitution.
00:15
So the derivative of u with respect to theta, du d theta, equals, and now we just go ahead and get the derivative of sine.
00:25
The derivative of sine is cosine of theta.
00:28
And now what you want to do is you want to solve this expression that i currently have, this derivative.
00:37
You want to solve it for du by multiplying both sides by d theta, and we would get the expression d of u equals cosine theta d of theta.
00:51
Now we have something to replace cosine theta d of theta.
00:57
Right here we replace it with du.
01:00
And we've already been given that we're going to replace the sine of theta with u, so the problem becomes u to the fourth du...