00:01
Okay, problem 88, we have the integral of sine square of x.
00:05
And off of bed, we haven't really learned anything about how to follow these types of intervals.
00:10
But if you remember your trigonometry, sine square of x is the same as one -half, one -minus, cosine 2x.
00:24
And we can use that right here.
00:25
So we're going to have integral, one -half, one -minus, cosine -2 -x, d -x.
00:35
Let's rewrite it as 1 .5 times the interval of 1 minus cosine 2x.
00:44
And we can take the interval of this.
00:46
So integral of 1 is just x minus integral of cosine 2x...