And what is cosine of 11 pi over two? Let's see, let's subtract some, let's subtract some multiple of two pi here to put it in values that we can understand better. So this is, so let me write it here. Cosine of 11 pi over two. That is the same thing as, let's see, if we were to subtract, this is the same thing as cosine of 11 pi over two minus, let's see, this is the same thing as five and 1 1⁄2 pi. Right? Yeah, so this is, so we could view this as, we could subtract, let's subtract four pi, which is going to be, we could write that as eight pi over two.