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. In fact, no, let's subtract five. Let's subtract, no, let's subtract four pi, which is eight pi over two. So once again, I'm just subtracting a multiple of two pi, which isn't gonna change the value of cosine.